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25 April 2024

» arxiv » 1304.5403

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Evolution of magnetic interactions in a pressure-induced Jahn-Teller driven magnetic dimensionality switch
S. Ghannadzadeh ; J. S. Möller ; P. A. Goddard ; T. Lancaster ; F. Xiao ; S. J. Blundell ; A. Maisuradze ; R. Khasanov ; J. L. Manson ; S. W. Tozer ; D. Graf ; J. A. Schlueter ;
Date:	19 Apr 2013
Abstract:	We present the results of high-field magnetization and muon-spin relaxation measurements on the coordination polymer CuF_2(H_2O)_2(pyrazine) in pressures up to 22.5 kbar. We observe a transition from a quasi-two-dimensional to a quasi-one-dimensional antiferromagnetic phase at 9.1 kbar, driven by a rotation of the Jahn-Teller axis. Long-range antiferromagnetic ordering is seen in both regimes, as well as a phase separation in the critical pressure region. The magnetic dimensionality switching as pressure is increased is accompanied by a halving of the primary magnetic exchange energy J and a fivefold decrease in the ordering temperature T_N. J decreases gradually with pressure in the two-dimensional phase, and then increases in the one-dimensional regime. We relate both effects to the changes in the crystal structure with applied pressure.
Source:	arXiv, 1304.5403
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