Giant Pressure Dependence and Dimensionality Switching in a Metal-Organic Quantum Antiferromagnet

Wehinger, Björn; Fiolka, C.; Lanza, A.; Scatena, R.; Kubus, M.; Grockowiak, A.; Coniglio, W. A.; Graf, D.; Skoulatos, M.; Chen, J.-H.; Gukelberger, J.; Casati, N.; Zaharko, O.; Macchi, P.; Krämer, K. W.; Tozer, S.; Mudry, C.; Normand, B.; Ruegg, Christian

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Title		Giant Pressure Dependence and Dimensionality Switching in a Metal-Organic Quantum Antiferromagnet
Authors		Wehinger, Björn Fiolka, C. Lanza, A. Scatena, R. Kubus, M. Grockowiak, A. Coniglio, W. A. Graf, D. Skoulatos, M. Chen, J.-H. Gukelberger, J. Casati, N. Zaharko, O. Macchi, P. Krämer, K. W. Tozer, S. Mudry, C. Normand, B. Ruegg, Christian show all authors [1 - 19]
Published in		Physical Review Letters. 2018, vol. 121, p. 117201
Abstract		We report an extraordinary pressure dependence of the magnetic interactions in the metal-organic system [CuF2(H2O)2]2pyrazine. At zero pressure, this material realizes a quasi-two-dimensional spin-1/2 square-lattice Heisenberg antiferromagnet. By high-pressure, high-field susceptibility measurements we show that the dominant exchange parameter is reduced continuously by a factor of 2 on compression. Above 18 kbar, a phase transition occurs, inducing an orbital re-ordering that switches the dimensionality, transforming the quasi-two-dimensional lattice into weakly coupled chains. We explain the microscopic mechanisms for both phenomena by combining detailed x-ray and neutron diffraction studies with quantitative modeling using spin-polarized density functional theory.
Keywords		Quantum magnetism — Low-dimensional quantum material — Metal-organic quantum material — Antiferromagnetism — Magnetic susceptibility — High magnetic field — High pressure — Spin-polarized density functional theory — Quantum Monte Carlo simulation
Identifiers		DOI: 10.1103/PhysRevLett.121.117201
Full text		Article (Published version) (871 Kb) - Free access
Structures		Faculté des sciences / Section de physique / Département de physique de la matière quantique
Research group		Groupe Ruegg
Projects		FP7: PSI-FELLOW H2020: HyperQC
Citation (ISO format)		WEHINGER, Björn et al. Giant Pressure Dependence and Dimensionality Switching in a Metal-Organic Quantum Antiferromagnet. In: Physical Review Letters, 2018, vol. 121, p. 117201. https://archive-ouverte.unige.ch/unige:107697