Evolution of magnetic interactions in a pressure-induced Jahn-Teller driven magnetic dimensionality switch
Evolution of magnetic interactions in a pressure-induced Jahn-Teller driven magnetic dimensionality switch
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DOI：
10.1103/physrevb.87.241102
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发表时间：
2013-06-12
影响因子：
3.7
通讯作者：
Schlueter, J. A.
中科院分区：
文献类型：
--
作者：
Ghannadzadeh, S.;Moeller, J. S.;Schlueter, J. A.
我们给出了配位聚合物CuF_2(H_2O)(2)(吡嗪)在高达22.5kbar压力下的高场磁化强度和介子-自旋弛豫测量结果。在Jahn-Teller轴旋转的驱动下，我们在9.1kbar观察到了从准二维反铁磁相到准一维反铁磁相的转变。在这两个区域都观察到了长程反铁磁有序，并且在临界压力区出现了相分离。随着压力的增加，磁维度的转换伴随着一次磁交换能J的减半和有序温度T-N的五倍下降。在二维相中，随着压力的增加，J逐渐减小，在一维相中，J随压力的增大而增大。我们将这两种效应与施加压力时晶体结构的变化联系起来。
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.