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Evolution of magnetic interactions in a pressure-induced Jahn-Teller driven magnetic dimensionality switch.

Ghannadzadeh, S. and Möller, J.S. and Goddard, P.A. and Lancaster, T. and Xiao, F. and Blundell, S.J. and Maisuradze, A. and Khasanov, R. and Manson, J.L. and Tozer, S.W. and Graf, D. and Schlueter, J.A. (2013) 'Evolution of magnetic interactions in a pressure-induced Jahn-Teller driven magnetic dimensionality switch.', Physical review B., 87 (24). p. 241102.

Abstract

We present the results of high-field magnetization and muon-spin relaxation measurements on the coordination polymer CuF 2 (H 2 O) 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.

Item Type:Article
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Status:Peer-reviewed
Publisher Web site:http://dx.doi.org/10.1103/PhysRevB.87.241102
Publisher statement:© 2013 American Physical Society
Date accepted:No date available
Date deposited:24 January 2014
Date of first online publication:June 2013
Date first made open access:No date available

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