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Investigating quantum criticality via magnetic resonance

English title Investigating quantum criticality via magnetic resonance
Applicant Shiroka Toni
Number 144519
Funding scheme Project funding
Research institution Laboratorium für Festkörperphysik ETH Zürich
Institution of higher education ETH Zurich - ETHZ
Main discipline Condensed Matter Physics
Start/End 01.10.2012 - 30.09.2015
Approved amount 177'516.00
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Keywords (6)

Strongly-correlated electron systems; High-pressure physics; Heavy-fermion materials; One-dimensional spin systems; Quantum phase transitions; Nuclear magnetic resonance

Lay Summary (English)

Lead
Lay summary

Investigating quantumcriticality via nuclear magnetic resonance (NMR)

Close to the absolute zero oftemperature, materials exhibit properties that are dominated by quantumeffects. In this regime, transitions between different states of matter drivenby quantum rather than by thermal fluctuations are possible. Studies of theso-called quantum phase transitions (QPTs), that connect competing groundstates across a quantum critical point, provide new insights into problems relatedto strong interactions and entanglement in condensed matter. The presence of aQCP is also felt at non-zero temperatures, where it is supposed to control thephysics of systems such as high-temperature and other exotic superconductors,transition metal oxides, metamagnetic materials, etc.

Our project aims to addressthe behaviour of materials close to a quantum critical point, with a particularemphasis on the dynamics of the corresponding elementary excitations. In ourexperimental approach we employ mainly NMR methods, complemented by suitableother experimental techniques. The unique possibility of performing NMRexperiments on materials under the extreme conditions that are required toaccess the quantum critical regime (including ultra-low temperatures, highpressure and high magnetic fields), makes NMR one of the most favourableexperimental tools for exploring quantum criticality.

Direct link to Lay Summary Last update: 21.02.2013

Responsible applicant and co-applicants

Employees

Publications

Publication
Pairing of weakly correlated electrons in the platinum-based centrosymmetric superconductor SrPt3P
Shiroka T., Pikulski M., Zhigadlo N. D., Batlogg B., Mesot J., Ott H. R. (2015), Pairing of weakly correlated electrons in the platinum-based centrosymmetric superconductor SrPt3P, in Physical Review B - Condensed Matter and Materials Physics, 91(24), 245143.
Slow magnetic fluctuations and superconductivity in fluorine-doped NdFeAsO
Lamura G., Shiroka T., Bonfà P., Sanna S., De Renzi R., Putti M., Zhigadlo N. D., Katrych S., Khasanov R., Karpinski J. (2015), Slow magnetic fluctuations and superconductivity in fluorine-doped NdFeAsO, in Physical Review B - Condensed Matter and Materials Physics, 91(2), 024513.
A firmware-defined digital direct-sampling NMR spectrometer for condensed matter physics
Pikulski M., Shiroka T., Ott H. R., Mesot J. (2014), A firmware-defined digital direct-sampling NMR spectrometer for condensed matter physics, in Review of Scientific Instruments, 85(9), 093906.
Crossover between magnetism and superconductivity in LaFeAsO with low H-doping level
Lamura G., Shiroka T., Bonfà P., Sanna S., De Renzi R., Caglieris F., Cimberle M. R., Iimura S., Hosono H., Putti M. (2014), Crossover between magnetism and superconductivity in LaFeAsO with low H-doping level, in Journal of Physics Condensed Matter, 26(29), 295701.
A magnetic glassy phase in Fe(1+y)SexTe(1−x) single crystals
Lamura G, Shiroka T, Bonfà P, Sanna S, Bernardini F, De Renzi R, Viennois R, Giannini E, Piriou A, Emery N, Cimberle M R, Putti M (2013), A magnetic glassy phase in Fe(1+y)SexTe(1−x) single crystals, in Journal of Physics: Condensed Matter, 25(15), 156004-156004.
Competing magnetic interactions in the graphite-intercalation compound Li0.25Eu1.95C6
Shiroka T., Thede M., Wittenfeld L., Litterst F. J., Cahen S., Rida H., Emery N., Marêché J. F., Lagrange P., Hérold C. (2013), Competing magnetic interactions in the graphite-intercalation compound Li0.25Eu1.95C6, in Carbon, 63, 294-302.
Field dependence of the superconducting gap in YPd2Sn: A μsR and NMR study
Morenzoni E., Saadaoui H., Amato A., Baines C., Luetkens H., Pomjakushina E., Pikulski M., Shiroka T. (2013), Field dependence of the superconducting gap in YPd2Sn: A μsR and NMR study, in Journal of Physics: Conference Series, 551(1), 012027.
Field-induced quantum soliton lattice in a frustrated two-leg spin-1/2 ladder
Casola F., Shiroka T., Feiguin A., Wang S., Grbić M. S., Horvatić M., Krämer S., Mukhopadhyay S., Conder K., Berthier C., Ott H. R., Rønnow H. M., Rüegg Ch, Mesot J. (2013), Field-induced quantum soliton lattice in a frustrated two-leg spin-1/2 ladder, in Physical Review Letters, 110(18), 187201.
Impact of strong disorder on the static magnetic properties of the spin-chain compound BaCu2SiGeO7
Shiroka T., Casola F., Lorenz W., Prša K., Zheludev A., Ott H. R., Mesot J. (2013), Impact of strong disorder on the static magnetic properties of the spin-chain compound BaCu2SiGeO7, in Physical Review B - Condensed Matter and Materials Physics, 88(5), 054422.
Onset of magnetism in optimally electron-doped LFe(1−x)RuxAsO(1−y)Fy (L=La, Nd, or Sm) superconductors around x=1/4
Sanna S., Carretta P., De Renzi R., Prando G., Bonfà P., Mazzani M., Lamura G., Shiroka T., Kobayashi Y., Sato M. (2013), Onset of magnetism in optimally electron-doped LFe(1−x)RuxAsO(1−y)Fy (L=La, Nd, or Sm) superconductors around x=1/4, in Physical Review B, 87(13), 134518.
Onset of magnetism in optimally electron-doped LFe1-xRu xAsO1-yFy (L=La, Nd, or Sm) superconductors around x=14
Sanna S., Carretta P., De Renzi R., Prando G., Bonfà P., Mazzani M., Lamura G., Shiroka T., Kobayashi Y., Sato M. (2013), Onset of magnetism in optimally electron-doped LFe1-xRu xAsO1-yFy (L=La, Nd, or Sm) superconductors around x=14, in Physical Review B - Condensed Matter and Materials Physics, 87(13), 134518.
Phase diagram of low-dimensional antiferromagnets with competing order parameters: A Landau-theory approach
Glazkov V. N., Casola F., Ott H. R., Shiroka T. (2013), Phase diagram of low-dimensional antiferromagnets with competing order parameters: A Landau-theory approach, in Physical Review B - Condensed Matter and Materials Physics, 87(5), 054427.
Role of in-plane and out-of-plane dilution in CeFeAsO: Charge doping versus disorder
Prando G., Vakaliuk O., Sanna S., Lamura G., Shiroka T., Bonfà P., Carretta P., De Renzi R., Klauss H.-H, Blum C. G. F., Wurmehl S., Hess C., Büchner B. (2013), Role of in-plane and out-of-plane dilution in CeFeAsO: Charge doping versus disorder, in Physical Review B - Condensed Matter and Materials Physics, 87, 174519.
s-wave pairing in the optimally doped LaO0.5F0.5BiS2 superconductor
Lamura G., Shiroka T., Bonfà P., Sanna S., De Renzi R., Baines C., Luetkens H., Kajitani J., Mizuguchi Y., Miura O., Deguchi K., Demura S., Takano Y., Putti M. (2013), s-wave pairing in the optimally doped LaO0.5F0.5BiS2 superconductor, in Physical Review B - Condensed Matter and Materials Physics, 88(18), 180509.
μsR and NMR study of the superconducting Heusler compound YPd2Sn
Saadaoui H., Shiroka T., Amato A., Baines C., Luetkens H., Pomjakushina E., Pomjakushin V., Mesot J., Pikulski M., Morenzoni E. (2013), μsR and NMR study of the superconducting Heusler compound YPd2Sn, in Physical Review B - Condensed Matter and Materials Physics, 88(9), 094518.
A two-axis goniometer for low-temperature nuclear magnetic resonance measurements on single crystals
Shiroka T., Casola F., Mesot J., Bachmann W., Ott H. R. (2012), A two-axis goniometer for low-temperature nuclear magnetic resonance measurements on single crystals, in Review of Scientific Instruments, 83(9), 093901.
Dimensional crossover of spin chains in a transverse staggered field: An NMR study
Casola F., Shiroka T., Glazkov V., Feiguin A., Dhalenne G., Revcolevschi A., Zheludev A., Ott H. R., Mesot J. (2012), Dimensional crossover of spin chains in a transverse staggered field: An NMR study, in Physical Review B - Condensed Matter and Materials Physics, 86(16), 165111.
Experimental investigation of the low-temperature features of a random Heisenberg spin chain
Shiroka T., Casola F., Glazkov V., Zheludev A., Revcolevschi A., Dhalenne G., Prša K., Ott H. R., Mesot J. (2012), Experimental investigation of the low-temperature features of a random Heisenberg spin chain, in Journal of Physics: Conference Series, 400(3), 032089.

Collaboration

Group / person Country
Types of collaboration
M. Siegrist / ETHZ Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
K. Conder / PSI Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
H. M. Ronnow / EPFL Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
C. Berthier / LNCMI Grenoble France (Europe)
- Publication
- Research Infrastructure
Z. Fisk / Univ. California United States of America (North America)
- in-depth/constructive exchanges on approaches, methods or results
Ch. Rüegg / PSI Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
H.-R. Ott / ETHZ Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
A. Maisuradze / PSI Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
M. Horvatic / LNCMI Grenoble France (Europe)
- Publication
- Research Infrastructure
K. Krämer / Univ. Bern Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Research Infrastructure
V. Glazkov / Kapitza Institute Russia (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
N. Zhigadlo / ETHZ Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Research Infrastructure

Scientific events

Active participation

Title Type of contribution Title of article or contribution Date Place Persons involved
Materials and Mechanisms of Superconductivity 2015 Poster Superconductivity and slow-fluctuating magnetism in NdFeAsO(1-x)F(x) 23.08.2015 Geneve, Switzerland Shiroka Toni;
Materials and Mechanisms of Superconductivity 2015 Poster Strongly-coupled pairing of weakly correlated electrons in the platinum-based SrPt3P superconductor 23.08.2015 Barcelona, Switzerland Shiroka Toni;
Intl. Conference on Magnetism Poster Slowly-fluctuating magnetism and superconductivity in NdFeAsO1-xFx: new physics or déjà-vu? 05.07.2015 Barcelona, Spain Shiroka Toni;
Intl. Conference on Magnetism Poster A firmware-defined digital direct-sampling NMR spectrometer for condensed-matter physics 05.07.2015 Barcelona, Spain Pikulski Marek Adam;
Intl. Conference on Magnetism Poster From order to randomness: An experimental investigation of disorder in a one-dimensional spin system 05.07.2015 Barcelona, Spain Shiroka Toni;
Intl. Conference on Magnetism Talk given at a conference Superconductivity in SrPt3P: An NMR study and comparison with non-centrosymmetric LaPt3Si and CePt3Si 05.07.2015 Barcelona, Spain Shiroka Toni;
Intl. Conference on Magnetism Poster Low-energy magnetic excitations in La_{1.855}Sr{0.145}CuO_4 in the vicinity of a quantum-critical point 05.07.2015 Barcelona, Spain Pikulski Marek Adam;
Intl. Conference on Research in High Magnetic Fields Poster Nuclear magnetic-resonance investigation of the magnetism in BiCu2PO6 in high magnetic fields 01.07.2015 Grenoble, France Pikulski Marek Adam;
Workshop on Unconventional High-Tc Superconductors Talk given at a conference 1D spin systems at high magnetic fields: from toy models to research tools 13.07.2014 IFW Dresden, Germany Shiroka Toni;
Annual Meeting of the Swiss Physical Society Poster An FPGA-based direct-digital NMR spectrometer: How software replaces the soldering iron 29.06.2014 Fribourg, Switzerland Pikulski Marek Adam;
Annual Meeting of the Swiss Physical Society Poster From order to randomness: a one-dimensional journey to disorder 01.06.2014 Fribourg, Switzerland Shiroka Toni;
Intl. Conference on Muon Spin Rotation Poster Superconductivity in eutectically-grown mixed ruthenates: A µSR study 01.06.2014 Grindelwald, Switzerland Shiroka Toni;
Intl. Conference on Muon Spin Rotation Talk given at a conference Low-temperature magnetic phases in Ba2CuGe2O7 01.06.2014 Grindelwald, Switzerland Shiroka Toni;
Invited Talk Individual talk One-dimensional spin systems: A laboratory for complex quantum matter 05.05.2014 CNISM and Dip.to di Fisica M. Melloni, Università di Parma, Italy Shiroka Toni;
Intl. Conference on Superconductivity and Magnetism Talk given at a conference Nature of pairing in the optimally-doped BiS2-based superconductors 27.04.2014 Antalya, Turkey Shiroka Toni;
Invited talk Individual talk Investigating competing orders in Fe-based superconductors via µSR 07.11.2013 Jozef Stefan Institute, Ljubljana, Slovenia Shiroka Toni;
Invited talk Individual talk One-dimensional spin systems in magnetic fields: from quantum disorder to magnetic-soliton lattices 14.10.2013 CNR and Dipartimento di Fisica “E. R. Caianiello”, Università di Salerno, Italy Shiroka Toni;
Advances in Quantum Magnets Workshop Talk given at a conference NMR on disordered/frustrated quantum magnets 08.09.2013 Kolymbari, Greece Shiroka Toni;
Joint European Magnetic Symposia Talk given at a conference Strongly-disordered Heisenberg spin-1/2 chains: An NMR study 29.08.2013 Rhodes, Greece Shiroka Toni;


Communication with the public

Communication Title Media Place Year
Other activities Web site: Dynamics of strongly correlated materials International 2012

Associated projects

Number Title Start Funding scheme
127126 NMR/NQR studies of strongly correlated electron systems 01.10.2009 Project funding
169455 Exotic matter and correlated quantum phenomena 01.01.2017 Project funding
127126 NMR/NQR studies of strongly correlated electron systems 01.10.2009 Project funding

Abstract

The omnipresent thermal agitation excludes macroscopic quantum phenomena from our everyday experience. Close to the absolute zero, though, quantum coherence is preserved and transitions between different states of matter driven by quantum rather than thermal fluctuations are possible. Quantum phase transitions (QPTs), which connect competing ground states, provide new insights into long-standing problems related to, i.e., strong correlation and entanglement in condensed matter. Consequences of a quantum critical point, extended to finite temperatures, are believed to underlie the physics of systems such as high-temperature superconductors, heavy-fermion compounds, transition metal oxides, or metamagnetic materials.The aim of the present project is to address, mainly through magnetic resonance techniques, but also by other complementary experimental methods, the behaviour of materials close to a quantum critical point, with a particular regard to the dynamics of their elementary excitations.The unique possibility of performing NMR experiments in the extreme environment required to access the quantum critical regime (including ultra-low temperature, high pressure and high magnetic fields), make NMR one of the best experimental tools to explore quantum criticality. The present project is characterized by the following key features:Focus and Novelty: Our research will concentrate mainly on NMR/NQR investigations of strongly correlated electron systems in the proximity of a quantum critical transition. The often difficult study of the dynamics of quantum criticality (due to limitations of the experimental tools) will represent the distinguishing trait of the current project.Feasibility and Timing: Although we plan to investigate matter in challenging conditions, the current project is firmly grounded on previous experience and relies on well mastered experimental techniques. The wide scope of the research would require a 3-year period and will involve two PhD students.Teamwork: The proposed research will rely on existing and new collaborations involving material scientists, condensed matter theorists and international collaborators. This type of approach is particularly rewarding in investigating complex condensed matter.Impact and Perspective: Our experiments, to be carried out on different systems, will provide new insights into the respective low-temperature domains, possibly allowing us to extrapolate the common features of the various quantum phase diagram. Ultimately, our contribution would help to understand how competing orders interact in strongly correlated electronic systems.
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