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

2013; American Physical Society; Volume: 87; Issue: 24 Linguagem: Inglês

10.1103/physrevb.87.241102

1550-235X

Saman Ghannadzadeh, Johannes S. Möller, Paul Goddard, Tom Lancaster, F. Xiao, Stephen J. Blundell, A. Maisuradze, R. Khasanov, Jamie L. Manson, S. W. Tozer, David Graf, John A. Schlueter,

Advanced Condensed Matter Physics

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 ${T}_{\text{N}}$. $J$ 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.