Project

Back to overview

Mott Physics Beyond the Heisenberg Model in Iridates and Related Materials

English title Mott Physics Beyond the Heisenberg Model in Iridates and Related Materials
Applicant Ronnow Henrik M.
Number 160765
Funding scheme Sinergia
Research institution Laboratoire de magnétisme quantique EPFL - SB - IPMC - LQM
Institution of higher education EPF Lausanne - EPFL
Main discipline Condensed Matter Physics
Start/End 01.01.2016 - 31.12.2019
Approved amount 2'315'429.00
Show all

All Disciplines (2)

Discipline
Condensed Matter Physics
Theoretical Physics

Keywords (5)

Heisenberg model; Mott physics; Hubbard model; iridates; Metal insulator transition

Lay Summary (Italian)

Lead
Nei metalli gli elettroni si muovono liberamente e possono quindi trasportare energia e informazione. Negli isolanti gli elettroni sono legati agli atomi. In alcune classi di materiali gli elettroni possono passare da un atomo all’altro tramite processi di salto quantistico. Tali elettroni danno origine collettivamente a un insieme estremamente ricco di fenomeni che costituisce la cosiddetta “fisica di Mott”. Il progetto Sinergia “Fisica di Mott oltre il modello di Heisenberg” esplora l’apparizione di fenomeni di tipo Mott in nuovi materiali.
Lay summary

Lo stato isolante di Mott è una conseguenza fondamentale di interazioni forti tra gli elettroni e della meccanica quantistica. Nella sua forma piu’ semplice il settore di bassa energia è poroiettato sul modello di Heisenberg magnetico, e negli ultimi 60 anni questo modello ha giocato un ruolo fondamentale nella comprensione delle proprietà magnetiche degli isolanti Mott. Tuttavia è apparso sempre piu’ chiaramente che in alcuni casi possono emergere nuove fasi quantistiche della materia per le quali l’approssimazione di Heisenberg non è sufficiente. Questo progetto Sinergia riunisce dei gruppi leader nella sintesi di materiali, nelle tecniche sperimentali e nella teoria in un programma di ricerca mirato e coerente sui nuovi materiali oltre l’approssimazione di Heisenberg. In particolare i temi affrontati comprendono : i) la presenza di degenerazione di tipo orbitale, che introduce un nuovo grado di libertà ; ii) la vicinanza alla transizione metallo-isolante, dove interazioni piu’ complicate tra spin diventano importanti, o ancora iii) sistemi quali gli iridati, in cui uno spin-1/2 effettivo puo’ generare interazioni fortemente anisotrope. Inizialmente l’attività di ricerca si concentrerà sugli ossidi di iridio, una classe di materiali emergenti che suscita un notevole interesse. 

Direct link to Lay Summary Last update: 13.01.2016

Lay Summary (English)

Lead
In metals electrons are free to move and hence transport electric energy and informaiton. In insulators the electrons are stuck to the atoms. In some classes of materials the electrons can quantum mechanically hop between adjacent atoms. Collectively such hopping electrons give rise to surprisingly rich novel phenomena called Mott Physics. The Sinergia project Mott Physics Beyond the Heisenberg model explores emerging Mott phenomena in novel materials.
Lay summary
The Mott Insulating state is one of the most fundamental consequences of strong electron interaction in concert with quantum mechanics. In its simplest form, it projects the low energy sector onto a magnetic Heisenberg model, which has played a central role over the past sixty years of unveiling the magnetic properties of Mott insulators. However, it has become increasingly clear that new quantum phases of matter can occur in cases where the Heisenberg approximation is not sufficient. This Sinergia proposal aims to unite leading groups in their respective domains of material synthesis, experiments and theory for a focused coherent effort to study new materials beyond the Heisenberg approximation. Specifically, we shall investigate: i) the presence of orbital degeneracy, where an extra local degree of freedom has to be taken into account, ii) the proximity to the metal-insulator transition, where more complicated spin-spin interactions become significant, or iii) systems like iridates, where the effective local spin-1/2 degree of freedom may lead to strongly anisotropic interactions. The initial thrust will be on investigations of iridium-oxides – an emerging material class which has recently attracted considerable attention world-wide.
Direct link to Lay Summary Last update: 13.01.2016

Responsible applicant and co-applicants

Employees

Publications

Publication
Strain-engineering Mott-insulating La2CuO4
Ivashko O., Horio M., Wan W., Christensen N. B., McNally D. E., Paris E., Tseng Y., Shaik N. E., Rønnow H. M., Wei H. I., Adamo C., Lichtensteiger C., Gibert M., Beasley M. R., Shen K. M., Tomczak J. M., Schmitt T., Chang J. (2019), Strain-engineering Mott-insulating La2CuO4, in Nature Communications, 10(1), 786-786.
Electronic localization in CaVO3 films via bandwidth control
McNally Daniel E., Lu Xingye, Pelliciari Jonathan, Beck Sophie, Dantz Marcus, Naamneh Muntaser, Shang Tian, Medarde Marisa, Schneider Christof W., Strocov Vladimir N., Pomjakushina Ekaterina V., Ederer Claude, Radovic Milan, Schmitt Thorsten (2019), Electronic localization in CaVO3 films via bandwidth control, in npj Quantum Materials, 4(1), 6-6.
Reciprocity between local moments and collective magnetic excitations in the phase diagram of BaFe2(As1−xPx)2
Pelliciari Jonathan, Ishii Kenji, Huang Yaobo, Dantz Marcus, Lu Xingye, Olalde-Velasco Paul, Strocov Vladimir N., Kasahara Shigeru, Xing Lingyi, Wang Xiancheng, Jin Changqing, Matsuda Yuji, Shibauchi Takasada, Das Tanmoy, Schmitt Thorsten (2019), Reciprocity between local moments and collective magnetic excitations in the phase diagram of BaFe2(As1−xPx)2, in Communications Physics, 2(1), 139-139.
Persistent antiferromagnetic order in heavily overdoped Ca 1− x La x FeAs 2
Martino Edoardo, Bachmann Maja D, Rossi Lidia, Modic Kimberly A, Zivkovic Ivica, Rønnow Henrik M, Moll Philip J W, Akrap Ana, Forró László, Katrych Sergiy (2019), Persistent antiferromagnetic order in heavily overdoped Ca 1− x La x FeAs 2, in Journal of Physics: Condensed Matter, 31(48), 485705-485705.
Probing hydrogen bond strength in liquid water by resonant inelastic X-ray scattering
Vaz da Cruz Vinícius, Gel’mukhanov Faris, Eckert Sebastian, Iannuzzi Marcella, Ertan Emelie, Pietzsch Annette, Couto Rafael C., Niskanen Johannes, Fondell Mattis, Dantz Marcus, Schmitt Thorsten, Lu Xingye, McNally Daniel, Jay Raphael M., Kimberg Victor, Föhlisch Alexander, Odelius Michael (2019), Probing hydrogen bond strength in liquid water by resonant inelastic X-ray scattering, in Nature Communications, 10(1), 1013-1013.
Exploring the Kondo Effect of an Extended Impurity with Chains of Co Adatoms in a Magnetic Field
Danu Bimla, Assaad Fakher F., Mila Frédéric (2019), Exploring the Kondo Effect of an Extended Impurity with Chains of Co Adatoms in a Magnetic Field, in Physical Review Letters, 123(17), 176601-176601.
Magnetic and structural properties of Ni-substituted magnetoelectric Co4Nb2O9
Papi Hadi, Favre Virgile Yves, Ahmadvand Hossein, Alaei Mojtaba, Khondabi Mohammad, Sheptyakov Denis, Keller Lukas, Kameli Parviz, Živković Ivica, Rønnow Henrik M. (2019), Magnetic and structural properties of Ni-substituted magnetoelectric Co4Nb2O9, in Physical Review B, 100(13), 134408-134408.
Magnetic Contrast at Spin-Flip Excitations: An Advanced X-Ray Spectroscopy Tool to Study Magnetic-Ordering
Elnaggar Hebatalla, Wang Ru-Pan, Lafuerza Sara, Paris Eugenio, Tseng Yi, McNally Daniel, Komarek Alexander, Haverkort Maurits, Sikora Marcin, Schmitt Thorsten, de Groot Frank M. F. (2019), Magnetic Contrast at Spin-Flip Excitations: An Advanced X-Ray Spectroscopy Tool to Study Magnetic-Ordering, in ACS Applied Materials & Interfaces, 11(39), 36213-36220.
Field-induced anisotropy in the quasi-two-dimensional weakly anisotropic antiferromagnet [CuCl(pyz)2]BF4
Kwon Sungmin, Jeong M., Kubus M., Wehinger B., Krämer K. W., Rüegg Ch., Rønnow H. M., Lee Soonchil (2019), Field-induced anisotropy in the quasi-two-dimensional weakly anisotropic antiferromagnet [CuCl(pyz)2]BF4, in Physical Review B, 99(21), 214403-214403.
Orbital-selective confinement effect of Ru 4d orbitals in SrRuO3 ultrathin film
Kang Soonmin, Tseng Yi, Kim Beom Hyun, Yun Seokhwan, Sohn Byungmin, Kim Bongju, McNally Daniel, Paris Eugenio, Kim Choong H., Kim Changyoung, Noh Tae Won, Ishihara Sumio, Schmitt Thorsten, Park Je-Geun (2019), Orbital-selective confinement effect of Ru 4d orbitals in SrRuO3 ultrathin film, in Physical Review B, 99(4), 045113-045113.
Resolving the nature of electronic excitations in resonant inelastic x-ray scattering
Kang M., Pelliciari J., Krockenberger Y., Li J., McNally D. E., Paris E., Liang R., Hardy W. N., Bonn D. A., Yamamoto H., Schmitt T., Comin R. (2019), Resolving the nature of electronic excitations in resonant inelastic x-ray scattering, in Physical Review B, 99(4), 045105-045105.
Probing multi-spinon excitations outside of the two-spinon continuum in the antiferromagnetic spin chain cuprate Sr2CuO3
Schlappa J., Kumar U., Zhou K. J., Singh S., Mourigal M., Strocov V. N., Revcolevschi A., Patthey L., Rønnow H. M., Johnston S., Schmitt T. (2018), Probing multi-spinon excitations outside of the two-spinon continuum in the antiferromagnetic spin chain cuprate Sr2CuO3, in Nature Communications, 9(1), 5394-5394.
Direct electric field control of the skyrmion phase in a magnetoelectric insulator
Kruchkov A. J., White J. S., Bartkowiak M., Živković I., Magrez A., Rønnow H. M. (2018), Direct electric field control of the skyrmion phase in a magnetoelectric insulator, in Scientific Reports, 8(1), 10466-10466.
Decoupling Carrier Concentration and Electron-Phonon Coupling in Oxide Heterostructures Observed with Resonant Inelastic X-Ray Scattering
Meyers D., Nakatsukasa Ken, Mu Sai, Hao Lin, Yang Junyi, Cao Yue, Fabbris G., Miao Hu, Pelliciari J., McNally D., Dantz M., Paris E., Karapetrova E., Choi Yongseong, Haskel D., Shafer P., Arenholz E., Schmitt Thorsten, Berlijn Tom, Johnston S., Liu Jian, Dean M. P. M. (2018), Decoupling Carrier Concentration and Electron-Phonon Coupling in Oxide Heterostructures Observed with Resonant Inelastic X-Ray Scattering, in Physical Review Letters, 121(23), 236802-236802.
Chemical and hydrostatic-pressure effects on the Kitaev honeycomb material Na2IrO3
Simutis G., Barbero N., Rolfs K., Leroy-Calatayud P., Mehlawat K., Khasanov R., Luetkens H., Pomjakushina E., Singh Y., Ott H.-R., Mesot J., Amato A., Shiroka T. (2018), Chemical and hydrostatic-pressure effects on the Kitaev honeycomb material Na2IrO3, in Physical Review B, 98(10), 104421-104421.
Three-Dimensional Fermi Surface of Overdoped La-Based Cuprates
Horio M., Hauser K., Sassa Y., Mingazheva Z., Sutter D., Kramer K., Cook A., Nocerino E., Forslund O. K., Tjernberg O., Kobayashi M., Chikina A., Schröter N. B. M., Krieger J. A., Schmitt T., Strocov V. N., Pyon S., Takayama T., Takagi H., Lipscombe O. J., Hayden S. M., Ishikado M., Eisaki H., Neupert T., et al. (2018), Three-Dimensional Fermi Surface of Overdoped La-Based Cuprates, in Physical Review Letters, 121(7), 077004-077004.
Sr 2 Pt 8− x As: a layered incommensurately modulated metal with saturated resistivity
Martino Edoardo, Arakcheeva Alla, Autès Gabriel, Pisoni Andrea, Bachmann Maja D., Modic Kimberly A., Helm Toni, Yazyev Oleg V., Moll Philip J. W., Forró László, Katrych Sergiy, Martino Edoardo, Arakcheeva Alla, Autès Gabriel, Pisoni Andrea, Bachmann Maja D., Modic Kimberly A., Helm Toni, Yazyev Oleg V., Moll Philip J. W., Forró László, Katrych Sergiy, Martino Edoardo, Arakcheeva Alla, et al. (2018), Sr 2 Pt 8− x As: a layered incommensurately modulated metal with saturated resistivity, in IUCrJ, 5(4), 470-477.
Resonant inelastic x-ray scattering studies of magnons and bimagnons in the lightly doped cuprate La2−xSrxCuO4
Chaix L., Huang E. W., Gerber S., Lu X., Jia C., Huang Y., McNally D. E., Wang Y., Vernay F. H., Keren A., Shi M., Moritz B., Shen Z.-X., Schmitt T., Devereaux T. P., Lee W.-S. (2018), Resonant inelastic x-ray scattering studies of magnons and bimagnons in the lightly doped cuprate La2−xSrxCuO4, in Physical Review B, 97(15), 155144-155144.
A -cation control of magnetoelectric quadrupole order in A(TiO)Cu4(PO4)4(A=Ba,Sr,and Pb)
Kimura K., Toyoda M., Babkevich P., Yamauchi K., Sera M., Nassif V., Rønnow H. M., Kimura T. (2018), A -cation control of magnetoelectric quadrupole order in A(TiO)Cu4(PO4)4(A=Ba,Sr,and Pb), in Physical Review B, 97(13), 134418-134418.
Note: Commercial SQUID magnetometer-compatible NMR probe and its application for studying a quantum magnet
Vennemann T., Jeong M., Yoon D., Magrez A., Berger H., Yang L., Živković I., Babkevich P., Rønnow H. M. (2018), Note: Commercial SQUID magnetometer-compatible NMR probe and its application for studying a quantum magnet, in Review of Scientific Instruments, 89(4), 046101-046101.
Spin-Orbital Excitations in Ca2RuO4 Revealed by Resonant Inelastic X-Ray Scattering
Das L., Forte F., Fittipaldi R., Fatuzzo C. G., Granata V., Ivashko O., Horio M., Schindler F., Dantz M., Tseng Yi, McNally D. E., Rønnow H. M., Wan W., Christensen N. B., Pelliciari J., Olalde-Velasco P., Kikugawa N., Neupert T., Vecchione A., Schmitt T., Cuoco M., Chang J. (2018), Spin-Orbital Excitations in Ca2RuO4 Revealed by Resonant Inelastic X-Ray Scattering, in Physical Review X, 8(1), 011048-011048.
Dispersive magnetic and electronic excitations in iridate perovskites probed by oxygen K -edge resonant inelastic x-ray scattering
Lu Xingye, Olalde-Velasco Paul, Huang Yaobo, Bisogni Valentina, Pelliciari Jonathan, Fatale Sara, Dantz Marcus, Vale James G., Hunter E. C., Chang Johan, Strocov Vladimir N., Perry R. S., Grioni Marco, McMorrow D. F., Rønnow Henrik M., Schmitt Thorsten (2018), Dispersive magnetic and electronic excitations in iridate perovskites probed by oxygen K -edge resonant inelastic x-ray scattering, in Physical Review B, (4), 041102-041102.
Magnetic structure of Ba(TiO)Cu4(PO4)4 probed using spherical neutron polarimetry
Babkevich P., Testa L., Kimura K., Kimura T., Tucker G. S., Roessli B., Rønnow H. M. (2017), Magnetic structure of Ba(TiO)Cu4(PO4)4 probed using spherical neutron polarimetry, in Physical Review B, 96(21), 214436-214436.
Charge-Stripe Order and Superconductivity in Ir1−xPtxTe2
Ivashko O., Yang L., Destraz D., Martino E., Chen Y., Guo C. Y., Yuan H. Q., Pisoni A., Matus P., Pyon S., Kudo K., Nohara M., Forró L., Rønnow H. M., Hücker M., v. Zimmermann M., Chang J. (2017), Charge-Stripe Order and Superconductivity in Ir1−xPtxTe2, in Scientific Reports, 7(1), 17157-17157.
Mapping the lattice dynamical anomaly of the order parameters across the Verwey transition in magnetite
Borroni S, Tucker G S, Pennacchio F, Rajeswari J, Stuhr U, Pisoni A, Lorenzana J, Rønnow H M, Carbone F (2017), Mapping the lattice dynamical anomaly of the order parameters across the Verwey transition in magnetite, in New Journal of Physics, 19(10), 103013-103013.
Electronic and magnetic excitations in the half-stuffed Cu-O planes of Ba2Cu3O4Cl2 measured by resonant inelastic x-ray scattering
Fatale S., Fatuzzo C. G., Babkevich P., Shaik N. E., Pelliciari J., Lu X., McNally D. E., Schmitt T., Kikkawa A., Taguchi Y., Tokura Y., Normand B., Rønnow H. M., Grioni M. (2017), Electronic and magnetic excitations in the half-stuffed Cu-O planes of Ba2Cu3O4Cl2 measured by resonant inelastic x-ray scattering, in Physical Review B, 96(11), 115149-115149.
Crossover from Collective to Incoherent Spin Excitations in Superconducting Cuprates Probed by Detuned Resonant Inelastic X-Ray Scattering
Minola M., Lu Y., Peng Y. Y., Dellea G., Gretarsson H., Haverkort M. W., Ding Y., Sun X., Zhou X. J., Peets D. C., Chauviere L., Dosanjh P., Bonn D. A., Liang R., Damascelli A., Dantz M., Lu X., Schmitt T., Braicovich L., Ghiringhelli G., Keimer B., Le Tacon M. (2017), Crossover from Collective to Incoherent Spin Excitations in Superconducting Cuprates Probed by Detuned Resonant Inelastic X-Ray Scattering, in Physical Review Letters, 119(9), 097001-097001.
Hallmarks of Hunds coupling in the Mott insulator Ca2RuO4
Sutter D., Fatuzzo C. G., Moser S., Kim M., Fittipaldi R., Vecchione A., Granata V., Sassa Y., Cossalter F., Gatti G., Grioni M., Rønnow H. M., Plumb N. C., Matt C. E., Shi M., Hoesch M., Kim T. K., Chang T-R, Jeng H-T, Jozwiak C., Bostwick A., Rotenberg E., Georges A., Neupert T., et al. (2017), Hallmarks of Hunds coupling in the Mott insulator Ca2RuO4, in Nature Communications, 8(1), 15176-15176.
Zone plates as imaging analyzers for resonant inelastic x-ray scattering
Marschall Felix, McNally Daniel, Guzenko Vitaliy A., Rösner Benedikt, Dantz Marcus, Lu Xingye, Nue Leonard, Strocov Vladimir, Schmitt Thorsten, David Christian (2017), Zone plates as imaging analyzers for resonant inelastic x-ray scattering, in Optics Express, 25(14), 15624-15624.
Doping Dependence of Collective Spin and Orbital Excitations in the Spin-1 Quantum Antiferromagnet La2−xSrxNiO4 Observed by X Rays
Fabbris G., Meyers D., Xu L., Katukuri V. M., Hozoi L., Liu X., Chen Z.-Y., Okamoto J., Schmitt T., Uldry A., Delley B., Gu G. D., Prabhakaran D., Boothroyd A. T., van den Brink J., Huang D. J., Dean M. P. M. (2017), Doping Dependence of Collective Spin and Orbital Excitations in the Spin-1 Quantum Antiferromagnet La2−xSrxNiO4 Observed by X Rays, in Physical Review Letters, 118(15), 156402-156402.
Incommensurate magnetic order in a quasicubic structure of the double-perovskite compound Sr2NiIrO6
Rolfs Katharina, Tóth Sandor, Pomjakushina Ekaterina, Adroja D.T., Khalyavin D., Conder Kazimierz (2017), Incommensurate magnetic order in a quasicubic structure of the double-perovskite compound Sr2NiIrO6, in Physical Review B, 95, 140403(R).
Local and collective magnetism of EuFe2As2
Pelliciari Jonathan, Ishii Kenji, Dantz Marcus, Lu Xingye, McNally Daniel E., Strocov Vladimir N., Xing Lingyi, Wang Xiancheng, Jin Changqing, Jeevan Hirale S., Gegenwart Philipp, Schmitt Thorsten (2017), Local and collective magnetism of EuFe2As2, in Physical Review B, 95(11), 115152-115152.
J1−J2 square-lattice Heisenberg antiferromagnets with 4d1 spins: AMoOPO4Cl(A=K,Rb)
Ishikawa Hajime, Nakamura Nanako, Yoshida Makoto, Takigawa Masashi, Babkevich Peter, Qureshi Navid, Rønnow Henrik M., Yajima Takeshi, Hiroi Zenji (2017), J1−J2 square-lattice Heisenberg antiferromagnets with 4d1 spins: AMoOPO4Cl(A=K,Rb), in Physical Review B, 95(6), 064408-064408.
Doping Evolution of Magnetic Order and Magnetic Excitations in (Sr1−xLax)3Ir2O7
Lu Xingye, McNally D. E., Moretti Sala M., Terzic J., Upton M. H., Casa D., Ingold G., Cao G., Schmitt T. (2017), Doping Evolution of Magnetic Order and Magnetic Excitations in (Sr1−xLax)3Ir2O7, in Physical Review Letters, 118(2), 027202-027202.
Time-resolved ARPES at LACUS: Band structure and ultrafast electron dynamics of solids
Crepaldi Alberto, Roth Silvan, Gatti Gianmarco, Arrell Christopher A., Ojeda José, Van Mourik Frank, Bugnon Philippe, Magrez Arnaud, Berger Helmuth, Chergui Majed, Grioni Marco (2017), Time-resolved ARPES at LACUS: Band structure and ultrafast electron dynamics of solids, in Chimia, 71(5), 273-277.
Probing strongly hybridized nuclear-electronic states in a model quantum ferromagnet
Kovacevic I., Babkevich P., Jeong M., Piatek J. O., Boero G., Ronnow H. M. (2016), Probing strongly hybridized nuclear-electronic states in a model quantum ferromagnet, in PHYSICAL REVIEW B, 94(21), 214433.
MnO nanoparticles as the cause of ferromagnetism in bulk dilute Mn-doped ZnO
Lançon Diane, Nilsen Gøran J., Wildes Andrew R., Nemkovski Kirill, Huang Ping, Fejes Dóra, Rønnow Henrik M., Magrez Arnaud (2016), MnO nanoparticles as the cause of ferromagnetism in bulk dilute Mn-doped ZnO, in Applied Physics Letters, 109(25), 252405-252405.
Magnetic Excitations and Electronic Interactions in Sr2CuTeO6: A Spin-1/2 Square Lattice Heisenberg Antiferromagnet
Babkevich P., Katukuri Vamshi M., Fak B., Rols S., Fennell T., Pajic D., Tanaka H., Pardini T., Singh R. R. P., Mitrushchenkov A., Yazyev O. V., Ronnow H. M. (2016), Magnetic Excitations and Electronic Interactions in Sr2CuTeO6: A Spin-1/2 Square Lattice Heisenberg Antiferromagnet, in PHYSICAL REVIEW LETTERS, 117(23), 237203.
Measurement of collective excitations in VO2 by resonant inelastic x-ray scattering
He Haowei, Gray A. X., Granitzka P., Jeong J. W., Aetukuri N. P., Kukreja R., Miao Lin, Breitweiser S. Alexander, Wu Jinpeng, Huang Y. B., Olalde-Velasco P., Pelliciari J., Schlotter W. F., Arenholz E., Schmitt T., Samant M. G., Parkin S. S. P., Durr H. A., Wray L. Andrew (2016), Measurement of collective excitations in VO2 by resonant inelastic x-ray scattering, in PHYSICAL REVIEW B, (16), 161119.
Ground-state oxygen holes and the metal-insulator transition in the negative charge-transfer rare-earth nickelates
Bisogni Valentina, Catalano Sara, Green Robert J., Gibert Marta, Scherwitzl Raoul, Huang Yaobo, Strocov Vladimir N., Zubko Pavlo, Balandeh Shadi, Triscone Jean-Marc, Sawatzky George, Schmitt Thorsten (2016), Ground-state oxygen holes and the metal-insulator transition in the negative charge-transfer rare-earth nickelates, in NATURE COMMUNICATIONS, 7, 13017.
Magnetodielectric detection of magnetic quadrupole order in Ba(TiO)Cu-4(PO4)(4) with Cu4O12 square cupolas
Kimura K., Babkevich P., Sera M., Toyoda M., Yamauchi K., Tucker G. S., Martius J., Fennell T., Manuel P., Khalyavin D. D., Johnson R. D., Nakano T., Nozue Y., Ronnow H. M., Kimura T. (2016), Magnetodielectric detection of magnetic quadrupole order in Ba(TiO)Cu-4(PO4)(4) with Cu4O12 square cupolas, in NATURE COMMUNICATIONS, 7, 13039.
Quenched Magnon excitations by oxygen sublattice reconstruction in (SrCuO2)n/(SrTiO3)2 superlattices.
Dantz M, Pelliciari J, Samal D, Bisogni V, Huang Y, Olalde-Velasco P, Strocov V N, Koster G, Schmitt T (2016), Quenched Magnon excitations by oxygen sublattice reconstruction in (SrCuO2)n/(SrTiO3)2 superlattices., in Scientific reports, 6, 32896-32896.
Possibility of an unconventional spin state of Ir4+ in Ba21Ir9O43 single crystal
Yang L., Jeong M., Arakcheeva A., Zivkovic I., Nafradi B., Magrez A., Pisoni A., Jacimovic J., Katukuri V. M., Katrych S., Shaik N. E., Yazyev O. V., Forro L., Ronnow H. M. (2016), Possibility of an unconventional spin state of Ir4+ in Ba21Ir9O43 single crystal, in PHYSICAL REVIEW B, 94(10), 104403.
Single crystals of superconducting SmFeAsOHx : Structure and properties
Pisoni A., Katrych S., Arakcheeva A., Verebélyi T., Bokor M., Huang P., Gaál R., Matus P., Karpinski J., Forró L. (2016), Single crystals of superconducting SmFeAsOHx : Structure and properties, in Physical Review B, (2), 024525-024525.
Pressure dependence of the structure and electronic properties of Sr3Ir2O7
Donnerer C., Feng Z., Vale J. G., Andreev S. N., Solovyev I. V., Hunter E. C., Hanfland M., Perry R. S., Ronnow H. M., McMahon M. I., Mazurenko V. V., McMorrow D. F. (2016), Pressure dependence of the structure and electronic properties of Sr3Ir2O7, in PHYSICAL REVIEW B, 93(17), 174118.
Dimensional Reduction in Quantum Dipolar Antiferromagnets
Babkevich P., Jeong M., Matsumoto Y., Kovacevic I., Finco A., Toft-Petersen R., Ritter C., Mansson M., Nakatsuji S., Ronnow H. M. (2016), Dimensional Reduction in Quantum Dipolar Antiferromagnets, in PHYSICAL REVIEW LETTERS, 116(19), 197202.
Intralayer doping effects on the high-energy magnetic correlations in NaFeAs
Pelliciari Jonathan, Huang Yaobo, Das Tanmoy, Dantz Marcus, Bisogni Valentina, Velasco Paul Olalde, Strocov Vladimir N., Xing Lingyi, Wang Xiancheng, Jin Changqing, Schmitt Thorsten (2016), Intralayer doping effects on the high-energy magnetic correlations in NaFeAs, in PHYSICAL REVIEW B, 93(13), 134515.
Electron-lattice interactions strongly renormalize the charge-transfer energy in the spin-chain cuprate Li2CuO2
Johnston Steve, Monney Claude, Bisogni Valentina, Zhou Ke-Jin, Kraus Roberto, Behr Günter, Strocov Vladimir N., Málek Jiři, Drechsler Stefan-Ludwig, Geck Jochen, Schmitt Thorsten, van den Brink Jeroen (2016), Electron-lattice interactions strongly renormalize the charge-transfer energy in the spin-chain cuprate Li2CuO2, in Nature Communications, 7(1), 10563-10563.
One-dimensional Bose-Einstein condensation of photons in a microtube
Kruchkov Alex J. (2016), One-dimensional Bose-Einstein condensation of photons in a microtube, in Physical Review A, 93(4), 043817-043817.
Origin of the Spin-Orbital Liquid State in a Nearly J=0 Iridate Ba3ZnIr2O9
Nag Abhishek, Middey S., Bhowal Sayantika, Panda S. K., Mathieu Roland, Orain J. C., Bert F., Mendels P., Freeman P. G., Mansson M., Ronnow H. M., Telling M., Biswas P. K., Sheptyakov D., Kaushik S. D., Siruguri Vasudeva, Meneghini Carlo, Sarma D. D., Dasgupta Indra, Ray Sugata (2016), Origin of the Spin-Orbital Liquid State in a Nearly J=0 Iridate Ba3ZnIr2O9, in Physical Review Letters, 116(9), 097205-097205.
Ba3MxTi3−xO9 (M = Ir, Rh): A family of 5d/4d-based diluted quantum spin liquids
Kumar R., Sheptyakov Denis, Khuntia P., Rolfs Katharina, Freeman P. G., Rønnow Henrik, Tusharkanti Dey, Baenitz M., Mahajan A. V. (2016), Ba3MxTi3−xO9 (M = Ir, Rh): A family of 5d/4d-based diluted quantum spin liquids, in PHYSICAL REVIEW B, 94, 174410.
Hybridization and electron-phonon coupling in ferroelectric BaTiO3 probed by resonant inelastic x-ray scattering
Fatale Sara, Moser Simon, Miyawaki Jun, Harada Yoshihisa, Grioni Marco (2016), Hybridization and electron-phonon coupling in ferroelectric BaTiO3 probed by resonant inelastic x-ray scattering, in Physical Review B, 94, 195131.
Novel Synthesis Method of Nonstoichiometric Na2-xIrO3
Rolfs Katharina, Pomjakushina Ekaterina, Sheptyakov Denis, Conder Kazimierz (2016), Novel Synthesis Method of Nonstoichiometric Na2-xIrO3, in Journal of Chemistry and Chemical Engineering, 10(6), 153-160.
Novel Synthesis Method of Nonstoichiometric Na2-xIrO3. Crystal Structure, Transport and Magnetic Properties.
Rolfs Katharina, Pomjakushina Ekaterina, Sheptyakov Denis, Conder Kazimierz (2016), Novel Synthesis Method of Nonstoichiometric Na2-xIrO3. Crystal Structure, Transport and Magnetic Properties., in Journal of Chemistry and Chemical Engineering, 10, 153-160.
Novel incommensurate magnetic order in a quasi cubic structure of the double
Rolfs Katharina, Toth Sandor, Pomjakushina Ekaterina, Devashibai Adroja, Khalyavin Dmitry, Conder Kazimierz, Novel incommensurate magnetic order in a quasi cubic structure of the double, in Physical Review B.

Scientific events



Self-organised

Title Date Place
MaNEP Workshop on Topological Quantum Phenomena 21.11.2016 University of Zurich, Switzerland

Associated projects

Number Title Start Funding scheme
179097 Electron-Donation for Superconductivity 01.01.2019 SNSF Professorships
177006 In-situ spectroscopy of oxide heterostructures 01.06.2018 R'EQUIP
182179 Frustration, topology and quantum effects in new realizations of antiferromagnetism 01.10.2018 Project funding (Div. I-III)
170773 A new high efficiency two-dimensional neutron detector for the cold-neutron diffractometer DMC at SINQ 01.11.2017 R'EQUIP
182536 New structures and dynamics emerging from frustration 01.12.2018 Project funding (Div. I-III)
150257 Dimensional and Anisotropy Control of Model Quantum Magnets 01.01.2014 Project funding (Div. I-III)
140862 Quantum Frustration in Model Magnets 01.07.2012 Project funding (Div. I-III)
150573 Fluctuations of boson and fermion condensates 01.01.2015 SNSF Professorships
178867 Electron-Phonon Interactions in Rare-Earth Nickelates and Superconducting Cuprates 01.10.2018 Project funding (Div. I-III)
162110 Harnessing Molecular Crystals for Quantum Magnets and Elucidating Quantum Critical Physics 01.03.2016 Bilateral programmes
157073 Exotic Mott insulating phases of strongly correlated electrons and cold atoms 01.10.2014 Project funding (Div. I-III)
155873 Quantum MAny-body Physics in Solids 01.08.2015 Temporary Backup Schemes
152734 Spin-liquid and spin-ice states in frustrated rare-earth and transition metal spinels 01.04.2014 SCOPES
141962 Mott Physics Beyond the Heisenberg Model in Iridates and Related Materials 01.01.2013 Sinergia
146870 Quantum Magnetism - Spinons, Skyrmions and Dipoles 01.04.2013 Project funding (Div. I-III)
170760 High-field THz source for pump-probe experiments at SwissFEL 01.11.2017 R'EQUIP
144972 High efficiency neutron spectrometer optimized for investigations under extreme conditions 01.01.2014 R'EQUIP
141325 Coupled spin, charge and orbital dynamics of low-dimensional cuprates 01.09.2013 Project funding (Div. I-III)
157009 High pressure synthesis of iron complex oxides in high oxidation state (Fe4+, Fe5+): mapping between localized and itinerant behavior 01.06.2015 Project funding (Div. I-III)
166298 Quantum Magnetism - Checkerboards, Skyrmions and Dipoles 01.06.2016 Project funding (Div. I-III)
182035 High resolution spectroscopy of strongly correlated electron systems and artificial structures at surfaces 01.12.2018 Project funding (Div. I-III)
150713 ZEBRA - a new neutron single-crystal diffractometer optimized for small samples and extreme conditions 01.11.2014 R'EQUIP

Abstract

The Mott Insulating state is one of the most fundamental consequences of strong electron interaction in concert with quantum mechanics. In its simplest form, it projects the low energy sector onto a magnetic Heisenberg model, which has played a central role over the past sixty years of unveiling the magnetic properties of Mott insulators. However, it has become increasingly clear that new quantum phases of matter can occur in cases where the Heisenberg approximation is not sufficient. This Sinergia proposal aims to unite leading groups in their respective domains of material synthesis, experiments and theory for a focused coherent effort to study new materials beyond the Heisenberg approximation. Specifically, we shall investigate . i) in the presence of orbital degeneracy, where an extra local degree of freedom has to be taken into account, ii) close to the metal-insulator transition, where more complicated spin-spin interactions become significant, or iii) systems like iridates, where the effective local spin-1/2 degree of freedom may lead to strongly anisotropic interactions. The initial thrust will be on investigations of iridium-oxides - an emerging material class which has recently attracted considerable attention world-wide.
-