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

Fiolka, C.
Lanza, A.
Scatena, R.
Kubus, M.
Grockowiak, A.
Coniglio, W. A.
Graf, D.
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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 magnetismLow-dimensional quantum materialMetal-organic quantum materialAntiferromagnetismMagnetic susceptibilityHigh magnetic fieldHigh pressureSpin-polarized density functional theoryQuantum Monte Carlo simulation
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Research group Groupe Ruegg
Projects FP7: PSI-FELLOW
H2020: HyperQC
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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

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Deposited on : 2018-09-12

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