Giant pressure dependence and dimensional crossover in a metal-organic Heisenberg antiferromagnet

Wehinger, Björn; Fiolka, Christoph; Graf, David; Coniglio, William A.; Grockowiak, Audrey; Chen, Jyong-Hao; Gukelberger, Jan; Skoulatos, Markus; Krämer, Karl; Tozer, Stan; Mudry, Christopher; Rüegg, Christian (2016). Giant pressure dependence and dimensional crossover in a metal-organic Heisenberg antiferromagnet (Submitted). NN

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Square-lattice Heisenberg antiferromagnets with magnetic exchange couplings of the order of a few Kelvin can be realized in metal-organic materials. Here, we report on high-precision susceptibility measurements of the quasi-two-dimensional square-lattice Heisenberg antiferromagnet (CuF2(H2O)2)2-pyrazine in high magnetic fields and at high pressures using a tunnel diode oscillator. A continuous change of the magnetic exchange couplings by a factor of 3.3 is observed upon application of external pressure. This change causes a dimensional crossover of the magnetic properties from quasi-two dimensions via three dimensions to quasi-one dimension. The pressure-dependence of the characteristic microscopic magnetic energy scales and magnetic response are computed by combining first principle calculations using spin-polarized density functional theory and Quantum Monte Carlo simulations. The giant pressure effect together with the computational benchmarks enable the design and control of magnetic properties in a diverse class of metalorganic materials over a large range of energy scales and dimensionalities.

Item Type:

Journal Article (Original Article)


08 Faculty of Science > Department of Chemistry, Biochemistry and Pharmaceutical Sciences (DCBP)

UniBE Contributor:

Fiolka, Christoph, Krämer, Karl


500 Science > 530 Physics
500 Science > 540 Chemistry




Karl Krämer

Date Deposited:

10 Jan 2017 11:28

Last Modified:

05 Dec 2022 15:00

ArXiv ID:





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