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.

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