Spin and orbital ordering in Y1-xLaxVO₃
Spin and orbital ordering in Y1-xLaxVO₃
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DOI：
10.1103/physrevb.84.214405
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发表时间：
2011-12
影响因子：
3.7
通讯作者：
Jiaqiang Yan;Jianshi Zhou;J. G. Cheng;J. Goodenough;Yang Ren;A. Llobet;R. McQueeney
中科院分区：
文献类型：
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作者：
Jiaqiang Yan;Jianshi Zhou;J. G. Cheng;J. Goodenough;Yang Ren;A. Llobet;R. McQueeney
研究了 Y1-xLaxVO₃ (0.30 ≤ x ≤ 1.0) 中的自旋和轨道排序，以绘制整个掺杂范围 0 ≤ x ≤ 1 的相图。该相图与没有 A 位方差的 RVO₃（R = 稀土或 Y）钙钛矿的相图进行了比较。当 x > 0.20 时，在磁有序温度 TN 以上没有观察到长程轨道有序；磁序伴随着 Tt ≤ TN 处的晶格异常，如 LaVO₃ 中那样。低于Tt ≤ TN 的磁序在成分范围0.20 ≤ x ≤ 0.40 内为G 型，在0.738 ≤ x ≤ 1.0 范围内为C 型。磁化和中子粉末衍射测量表明，两种磁性相在组成范围 0.4 < x < 0.738 内共存于 TN 以下。成分范围 0.20 < x ≤ 1.0 的样品的特征是在温度区间 TN < T < T* 内对玻璃态热导率的额外抑制以及 1/χ(T) 斜率的变化。我们认为 T* 代表一个温度，低于该温度时，自旋和轨道涨落通过 λL∙S 耦合在一起。
The spin and orbital ordering in Y1-xLaxVO₃ (0.30 ≤ x ≤ 1.0) has been studied to map out the phase diagram over the whole doping range 0 ≤ x ≤ 1. The phase diagram is compared with that for RVO₃ (R = rare earth or Y) perovskites without A-site variance. For x > 0.20, no long-range orbital ordering was observed above the magnetic ordering temperature TN; the magnetic order is accompanied by a lattice anomaly at a Tt ≤ TN as in LaVO₃. The magnetic ordering below Tt ≤ TN is G type in the compositional range 0.20 ≤ x ≤ 0.40 and C type in the range 0.738 ≤ x ≤ 1.0. Magnetization and neutron powder diffraction measurements point to the coexistence below TN of the two magnetic phases in the compositional range 0.4 < x < 0.738. Samples in the compositional range 0.20 < x ≤ 1.0 are characterized by an additional suppression of a glasslike thermal conductivity in the temperature interval TN < T < T* and a change in the slope of 1/χ(T). We argue that T* represents a temperature below which spin and orbital fluctuations couple together via λL∙S.