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

  title={Giant Pressure Dependence and Dimensionality Switching in a Metal-Organic Quantum Antiferromagnet.},
  author={Bj{\"o}rn Wehinger and Christoph Fiolka and Arianna E. Lanza and Rebecca Scatena and Mariusz Kubus and Audrey Grockowiak and William A. Coniglio and David E. Graf and M. Skoulatos and J.-H. Chen and Jan Gukelberger and Nicola P. M. Casati and Oksana Zaharko and Piero Macchi and Karl W. Kr{\"a}mer and Stanley W. Tozer and Christopher Mudry and B. Normand and Christian R{\"u}egg},
  journal={Physical review letters},
  volume={121 11},
We report an extraordinary pressure dependence of the magnetic interactions in the metal-organic system [CuF_{2}(H_{2}O)_{2}]_{2}pyrazine. 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… 
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