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

Published inPhysical Review Letters, vol. 121, 117201
Publication date2018
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
Research group
Funding
  • European Commission - International Fellowship Program on Materials & Matter, Energy & Environment, Human Health & Life-Sciences, and Accelerator Technology [290605]
  • European Commission - Hyper Quantum Criticality [681654]
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. doi: 10.1103/PhysRevLett.121.117201
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Article (Published version)
accessLevelPublic
Identifiers
ISSN of the journal0031-9007
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271downloads

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