Project

Back to overview

Dimensional and Anisotropy Control of Model Quantum Magnets

English title Dimensional and Anisotropy Control of Model Quantum Magnets
Applicant Krämer Karl
Number 150257
Funding scheme Project funding (Div. I-III)
Research institution Departement für Chemie und Biochemie Universität Bern
Institution of higher education University of Berne - BE
Main discipline Condensed Matter Physics
Start/End 01.01.2014 - 30.04.2017
Approved amount 344'496.00
Show all

All Disciplines (2)

Discipline
Condensed Matter Physics
Inorganic Chemistry

Keywords (4)

neutron scattering; quantum phase transitions; magnetic excitations; quantum magnetism

Lay Summary (German)

Lead
Das Projekt zielt auf die Synthese neuer Übergangsmetall- und Seltenerdverbindungen. Diese dienen als Modelsysteme, um exotische Ordnungen und elementare Anregungen von Quantenmagneten in niederdimensionalen Gittern mit reduzierter Spinsymmetrie zu untersuchen. Die Untersuchungsmethoden dazu sind inelastische Neutronenstreuung, makroskopische Transportmessungen und Messungen der thermodynamischen Eigenschaften.
Lay summary
Kontrolle der Dimensionalität von Quantenantiferromagneten. Im Fokus des Interesses stehen Metallkomplexe und ihre Derivate. In diesen Verbindungen wird die Dimension des magnetischen Austauschs durch Druck und chemisches Design verändert, sowie die Grund- und angeregten Zustände durch externe Magnetfelder. Die Übergänge von 2D→1D und 3D→2D in Antiferromagneten mit quadratischer Topologie werden im Detail untersucht. 

Kontrolle der Anisotropie in Quantenantiferromagneten. Über die Symmetrien und Anisotropien von Übergangsmetall- und Seltenerdhalogeniden und -oxiden werden das kritische Verhalten und effektive Potentiale von Quantensystemen kontrolliert, z.B. in Spinketten. Untersuchungen des kritischen Verhaltens von sogenannten clock Modellen, des Einflusses von Magnetfeldern auf kritische Punkte, sowie den Einsatz von Seltenerdionen als magnetische Proben in neuartigen Experimenten sind geplant.

Synthese neuer Materialien. Ausgehend von bekannten Metallkomplexen werden durch den Austausch von Liganden neue 2D Materialien mit quadratischer Topologie synthetisiert. Über die Liganden wird der magnetisch Austausch innerhalb und zwischen den Schichten kontrolliert und damit die Dimension des magnetischen Gitters bestimmt. Weiter dienen neuartige gemischte Seltenerd-Übergangsmetall Verbindungen als Model Systeme, um den Einfluss diskreter Spinsymmetrie auf das kritische Verhalten und die Dekohärenz zu untersuchen.

Direct link to Lay Summary Last update: 29.11.2013

Responsible applicant and co-applicants

Employees

Publications

Publication
Bound states and field-polarized Haldane modes in a quantum spin ladder
Ward S., Mena M., Bouillot P., Kollath C., Giamarchi T., Schmidt K.P., Normand B., Krämer K., Biner D., Guidi T., Boehm M., McMorrow D.F., Rüegg C. (2017), Bound states and field-polarized Haldane modes in a quantum spin ladder, in Phys. Rev. Lett., 118, 177202-6.
Phase diagram of diluted Ising ferromagnet LiHoxY1-xF4
Babkevich P., Nikseresht N., Kovacevic I., Piatek J.O., Dalla Piazza B., Kraemer C., Krämer K.W., Prokes K., Mataš S., Jensen J., Rønnow H.M. (2016), Phase diagram of diluted Ising ferromagnet LiHoxY1-xF4, in Phys. Rev. B, 94, 174443-8.
Copper-pyrazine magnetic polymers under high pressure
Lanza A., Scatena R., dos Santos L.H.R., Kubus M., Krämer K., Keller L., Fennell T., Wehinger B., Biffin A., Rüegg C., Casati N., Macchi P. (2016), Copper-pyrazine magnetic polymers under high pressure, in Acta Cryst. A, 72, s88.
Electron density analysis in quantum magnets
Scatena R., dos Santos L.H.R., Lanza A., Casati N., Wehinger B., Rüegg C., Kubus M., Krämer K., Keller L., Fennell T., Biffin A., Macchi P. (2016), Electron density analysis in quantum magnets, in Acta Cryst. A, 72, s313.
New antiferromagnets [CuX(pyz)2](BF4) with X = Cl and Br
Kubus M., Lanza A., Casati N., Macchi. P., Keller L., Fiolka C., Schefer J., Rüegg C., Krämer K. (2016), New antiferromagnets [CuX(pyz)2](BF4) with X = Cl and Br, in Acta Cryst. A, 72, s92.
Synthesis, Characterization, and Modeling of Magnetic Properties of a Hexanuclear Amino Alcohol-Supported {CoII2CoIII2DyIII2} Pivalate Cluster
Radu I., Kravtsov V.C., Krämer K., Decurtins S., Liu Shi-Xia, Reu O.S., Ostrovsky S.M., Klokishner S.I., Baca S.G. (2016), Synthesis, Characterization, and Modeling of Magnetic Properties of a Hexanuclear Amino Alcohol-Supported {CoII2CoIII2DyIII2} Pivalate Cluster, in J. Phys. Chem. C, 120, 7435-7443.
Composition Space Analysis in the Development of Copper Molybdate Hybrids Decorated by a Bifunctional Pyrazolyl/1,2,4-Triazole Ligand
Lysenko Andrey B., Senchyk Ganna A., Lukashuk Liliana V., Domasevitch Konstantin V., Handke Marcel, Lincke Jörg, Krautscheid Harald, Rusanov Eduard B., Krämer Karl W., Decurtins Silvio, Liu Shi-Xia (2016), Composition Space Analysis in the Development of Copper Molybdate Hybrids Decorated by a Bifunctional Pyrazolyl/1,2,4-Triazole Ligand, in Inorganic Chemistry, 55(1), 239-250.
Giant pressure dependence and dimensional crossover in a metal-organic Heisenberg antiferromagnet
Wehinger B., Fiolka C., Graf D., Coniglio W.A., Grockowiak A., Chen J.H., Gukelberger J., Skoulatos M., Krämer K., Tozer S., Mudry C., Rüegg Ch. (2016), Giant pressure dependence and dimensional crossover in a metal-organic Heisenberg antiferromagnet, in arXiv, 1606.08344.
Neutron spectroscopic study of crystal-field excitations and the effect of the crystal field on dipolar magnetism in LiRF4 ( R=Gd , Ho, Er, Tm, and Yb)
Babkevich P., Finco A., Jeong M., Dalla Piazza B., Kovacevic I., Klughertz G., Krämer K. W., Kraemer C., Adroja D. T., Goremychkin E., Unruh T., Strässle T., Di Lieto A., Jensen J., Rønnow H. M. (2015), Neutron spectroscopic study of crystal-field excitations and the effect of the crystal field on dipolar magnetism in LiRF4 ( R=Gd , Ho, Er, Tm, and Yb), in Physical Review B, 92(14), 144422-15.
Extraction of exchange parameters in transition-metal perovskites
Furrer A., Podlesnyak A., Krämer K. W. (2015), Extraction of exchange parameters in transition-metal perovskites, in Physical Review B, 92(10), 104415-6.
A one-dimensional coordination polymer based on Cu3-oximato metallacrowns bridged by benzene-1,4-dicarboxylato ligands: structure and magnetic properties
Croitor Lilia, Coropceanu Eduard B., Petuhov Oleg, Krämer Karl W., Baca Svetlana G., Liu Shi-Xia, Decurtins Silvio, Fonari Marina S. (2015), A one-dimensional coordination polymer based on Cu3-oximato metallacrowns bridged by benzene-1,4-dicarboxylato ligands: structure and magnetic properties, in Dalton Trans., 44(17), 7896-7902.
Nonequilibrium hysteresis and spin relaxation in the mixed-anisotropy dipolar-coupled spin-glass LiHo0.5Er0.5F4
Piatek J. O., Kovacevic I., Babkevich P., Dalla Piazza B., Neithardt S., Gavilano J., Krämer K. W., Rønnow H. M. (2014), Nonequilibrium hysteresis and spin relaxation in the mixed-anisotropy dipolar-coupled spin-glass LiHo0.5Er0.5F4, in Physical Review B, 90(17), 174427-6.
Defect propagation in one-, two-, and three-dimensional compounds doped by magnetic atoms
Furrer A., Podlesnyak A., Krämer K. W., Strässle Th. (2014), Defect propagation in one-, two-, and three-dimensional compounds doped by magnetic atoms, in Physical Review B, 90(14), 144434-6.
Quantum and classical criticality in a dimerized quantum antiferromagnet
Merchant P., Normand B., Krämer K. W., Boehm M., McMorrow D. F., Rüegg Ch. (2014), Quantum and classical criticality in a dimerized quantum antiferromagnet, in Nature Physics, 10(5), 373-379.
Propagation of defects in doped magnetic materials of different dimensionality
Furrer A., Podlesnyak A., Krämer K. W., Embs J. P., Pomjakushin V., Strässle Th. (2014), Propagation of defects in doped magnetic materials of different dimensionality, in Physical Review B, 89(14), 144402-5.
Interpenetrated (8,3)-c and (10,3)-b Metal–Organic Frameworks Based on {Fe(III)3} and {Fe(III)2Co(II)} Pivalate Spin Clusters
Botezat Olga, van Leusen Jan, Kravtsov Victor Ch., Filippova Irina G., Hauser Jürg, Speldrich Manfred, Hermann Raphaël P., Krämer Karl W., Liu Shi-Xia, Decurtins Silvio, Kögerler Paul, Baca Svetlana G. (2014), Interpenetrated (8,3)-c and (10,3)-b Metal–Organic Frameworks Based on {Fe(III)3} and {Fe(III)2Co(II)} Pivalate Spin Clusters, in Crystal Growth & Design, 14(9), 4721-4728.
Magnetic entropy landscape and Grüneisen parameter of a quantum spin ladder
Ryll H., Kiefer K., Rüegg Ch., Ward S., Krämer K. W., Biner D., Bouillot P., Coira E., Giamarchi T., Kollath C. (2014), Magnetic entropy landscape and Grüneisen parameter of a quantum spin ladder, in Physical Review B, 89(14), 144416-5.
Mixed-ligand hydroxocopper(II)/pyridazine clusters embedded into 3D framework lattices
Degtyarenko Anna S., Handke Marcel, Krämer Karl W., Liu Shi-Xia, Decurtins Silvio, Rusanov Eduard B., Thompson Laurence K., Krautscheid Harald, Domasevitch Konstantin V. (2014), Mixed-ligand hydroxocopper(II)/pyridazine clusters embedded into 3D framework lattices, in Dalton Trans., 43(22), 8530-8542.
New magnetic frameworks of [(CuF2(H2O)2)x(pyz)]
Lanza A., Fiolka C., Fisch M., Casati N., Skoulatos M., Rüegg C., Krämer K. W., Macchi Piero (2014), New magnetic frameworks of [(CuF2(H2O)2)x(pyz)], in Chem. Commun., 50(93), 14504-14507.
Observation of Anisotropic Exchange in a Spin Ladder by ESR
Čižmár E., Ozerov M., Krämer K.W., Rüegg Ch., Zvyagin S.A. (2014), Observation of Anisotropic Exchange in a Spin Ladder by ESR, in Acta Physica Polonica A, 126(1), 238-239.
Tetracarboxylate Ligands as New Chelates Supporting Copper(II) Paddlewheel-Like Structures
Gomila Antoine, Duval Sylvain, Besnard Céline, Krämer Karl W., Liu Shi-Xia, Decurtins Silvio, Williams Alan F. (2014), Tetracarboxylate Ligands as New Chelates Supporting Copper(II) Paddlewheel-Like Structures, in Inorganic Chemistry, 53(5), 2683-2691.
The Metallofullerene Field-Induced Single-Ion Magnet HoSc2N@C80
Dreiser Jan, Westerström Rasmus, Zhang Yang, Popov Alexey A., Dunsch Lothar, Krämer Karl, Liu Shi-Xia, Decurtins Silvio, Greber Thomas (2014), The Metallofullerene Field-Induced Single-Ion Magnet HoSc2N@C80, in Chemistry - A European Journal, 20(42), 13536-13540.
Triazolyl–Based Copper–Molybdate Hybrids: From Composition Space Diagram to Magnetism and Catalytic Performance
Senchyk Ganna A., Lysenko Andrey B., Babaryk Artem A., Rusanov Eduard B., Krautscheid Harald, Neves Patrícia, Valente Anabela A., Gonçalves Isabel S., Krämer Karl W., Liu Shi-Xia, Decurtins Silvio, Domasevitch Konstantin V. (2014), Triazolyl–Based Copper–Molybdate Hybrids: From Composition Space Diagram to Magnetism and Catalytic Performance, in Inorganic Chemistry, 53(19), 10112-10121.
Tunneling, remanence, and frustration in dysprosium-based endohedral single-molecule magnets
Westerström Rasmus, Dreiser Jan, Piamonteze Cinthia, Muntwiler Matthias, Weyeneth Stephen, Krämer Karl, Liu Shi-Xia, Decurtins Silvio, Popov Alexey, Yang Shangfeng, Dunsch Lothar, Greber Thomas (2014), Tunneling, remanence, and frustration in dysprosium-based endohedral single-molecule magnets, in Physical Review B, 89(6), 060406(R)-4.

Collaboration

Group / person Country
Types of collaboration
Prof. Corinna Kollath, theor. Quanten Physik, Rh. F.W. Univ. Bonn Germany (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
Prof. Andrey Lysenko, Inorg. Chemistry, Taras Shevchenko Nat. University of Kyiv Ukraine (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
Prof. Alain Williams, Inorg. Chemistry, University of Geneva Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
Prof. Thierry Giamarchi, Quantum Matter Physics, University of Geneva Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
Prof. Svetlana Baca, Appl. Physics, Acad. Sci. Moldova, Chisinau Moldova (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
Dr. Klaus Kiefer, Helmholtz-Zentrum Berlin für Materialien und Energie Germany (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Research Infrastructure

Associated projects

Number Title Start Funding scheme
132877 Magnetic Excitations in Low-Dimensional Arrays of Quantum Spins 01.01.2011 Project funding (Div. I-III)
172659 New materials for honeycomb-lattice and single-ion magnets 01.08.2017 Project funding (Div. I-III)
121397 Sub-Kelvin high sensitivity magnetometer for magnetic materials exploration 01.07.2008 R'EQUIP
162110 Harnessing Molecular Crystals for Quantum Magnets and Elucidating Quantum Critical Physics 01.03.2016 Bilateral programmes
105175 Magnetic excitations in low-dimensional compounds of transition metal ions 01.01.2005 Project funding (Div. I-III)
160765 Mott Physics Beyond the Heisenberg Model in Iridates and Related Materials 01.01.2016 Sinergia
170773 A new high efficiency two-dimensional neutron detector for the cold-neutron diffractometer DMC at SINQ 01.11.2017 R'EQUIP
166298 Quantum Magnetism - Checkerboards, Skyrmions and Dipoles 01.06.2016 Project funding (Div. I-III)
65120 Magnetic Neutron Scattering of Low Dimensional Transition Metal Ion Compounds 01.01.2002 Project funding (Div. I-III)
162626 Frustration in Quantum and Classical Magnets 01.12.2015 Project funding (Div. I-III)
164013 Laser-heated Floating Zone Furnace for EPFL Crystal Growth Facility 01.11.2016 R'EQUIP

Abstract

We propose a major new initiative to discover and synthesize novel transition-metal and rare-earth-based materials. These compounds will serve as model systems in which the fundamental phases, exotic order, and elementary excitations of quantum magnets with low-dimensional lattices and reduced spin symmetry will be studied by neutron spectroscopy and bulk experi-mental techniques:Project A:Dimensional Control of Quantum Antiferromagnets. The particular focus will be on the material CuF2(H2O)2pyz and its derivatives. Application of pressure and chemical design will be used to control the dimensionality of the metal-organic ex-change framework, and magnetic fields to tune its ground and excited states. We aim at a first detailed study of 2D-1D and 2D-3D transitions in square-lattice antiferromagnets.Project B:Anisotropy Control of Quantum Antiferromagnets. Exploring the symmetries and anisotropies of known transition metal and rare-earth halides and oxides we control criticality and effective potentials of quantum systems like spin chains. We will study the critical properties of clock materials, use magnetic fields to investigate critical points, and aim at controlling rare-earth spectator states in new types of experiments on such systems.Project C:Synthesis of New Materials. Synthesis of new 2D square-lattice compounds based on CuF2(H2O)2pyz with variation of ligands and interlayer exchange results in the first class of such material with dimensional control. Work on new mixed transition-metal/rare-earth materials and clock compounds produces the first model systems for studies of the effects of discrete spin symmetry on criticality and decoherence.
-