Magnetic Phase Diagram of YVO3 and TbVO3 under High Pressure
Magnetic Phase Diagram of YVO3 and TbVO3 under High Pressure
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YVO3 和 TbVO3 在高压下的磁相图
DOI：
10.1143/jpsj.81.024715
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
D. Bizen
中科院分区：
文献类型：
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作者：
金光玄樹;下條将徳;平田岳史;横山隆臣;大藤茂;D. Bizen
用低温和高压中子衍射技术研究了RVO_3（R= Y，Tb）的磁状态，得到了6.2GPa以下的压温磁相图。我们阐明了在压力作用下，磁基态从C型自旋有序（C-SO）转变为G型自旋有序（G-SO），这对应于轨道基态从G型轨道有序（G-OO）转变为C型轨道有序（C-OO）.有趣的是，G-SO跃迁与C-OO跃迁同时发生，而与G-OO跃迁不同时发生。当高压下C-OO相变温度超过G-OO相变温度时，G-OO相完全消失，同时发生自旋和轨道有序-无序相变。这种转变是钙钛矿型过渡金属氧化物中的第一种情况。
Magnetic states inRVO3(R= Y, Tb) were investigated using low-temperature and high-pressure neutron-diffraction techniques, and the pressure–temperature magnetic phase diagrams were clarified up to 6.2 GPa. We elucidated that, on application of pressure, the magnetic ground state changes fromC-type spin ordering (C-SO) toG-type spin ordering (G-SO); this corresponds to the orbital ground-state switching fromG-type orbital ordering (G-OO) toC-type orbital ordering (C-OO). It is also interesting that theG-SO transition occurs simultaneously with theC-OO transition, but not with theG-OO one. When the transition temperature ofC-OO exceeds that ofG-OO under high pressure, theG-OO phase vanishes completely, and a simultaneous spin and orbital order–disorder phase transition occurs. Such a transition is the first case in perovskite-type transition-metal oxides.