We present the results of high-field magnetization and muon-spin relaxation measurements on the coordination polymer CuF2(H2O)(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.
Original Publication Title
Physical Review B
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Ghannadzadeh, S; Moller, J S.; Goddard, P A.; Lancaster, T; Xiao, F; Blundell, S J.; Maisuradze, A; Khasanov, R; Manson, Jamie L.; Tozer, S W.; Graf, D; and Schlueter, J A., "Evolution Of Magnetic Interactions In A Pressure-Induced Jahn-Teller Driven Magnetic Dimensionality Switch" (2013). Chemistry and Biochemistry Faculty Publications. 14.