Anomalous pressure dependence of magnetic ordering temperature in Tb revealed by resistivity measurements to 141 GPa: Comparison with Gd and Dy
Anomalous pressure dependence of magnetic ordering temperature in Tb revealed by resistivity measurements to 141 GPa: Comparison with Gd and Dy
复制标题
DOI：
10.1103/physrevb.91.174428
复制
发表时间：
2015-05-26
影响因子：
3.7
通讯作者：
Schilling, J. S.
中科院分区：
文献类型：
--
作者：
Lim, J.;Fabbris, G.;Schilling, J. S.
在之前的研究中，发现 Dy 的磁有序温度 To 的压力依赖性在 73 GPa 的体积塌陷压力之上表现出急剧增加，似乎达到了远高于环境温度 157 GPa。在寻找第二个这样的镧系元素时，在 3.8-295 K 的温度范围内对邻近的 Tb 进行了电阻率测量，达到 141 GPa。低于 Tb 的体积塌陷压力 53 GPa，压力依赖性 T-o(P) 反映了 Dy 和 Gd 的压力依赖性。然而，在较高压力下，Tb 的 T-o(P) 变得高度反常。这一结果，加上 Y 中的稀 Tb 离子对超导性的强烈抑制，表明极压将 Tb 传输到具有异常高磁有序温度的非常规磁态。
In previous studies, the pressure dependence of the magnetic ordering temperature To of Dy was found to exhibit a sharp increase above its volume collapse pressure of 73 GPa, appearing to reach temperatures well above ambient at 157 GPa. In a search for a second such lanthanide, electrical resistivity measurements were carried out on neighboring Tb to 141 GPa over the temperature range 3.8-295 K. Below Tb's volume collapse pressure of 53 GPa, the pressure dependence T-o(P) mirrors that of both Dy and Gd. However, at higher pressures T-o(P) for Tb becomes highly anomalous. This result, together with the very strong suppression of superconductivity by dilute Tb ions in Y, suggests that extreme pressure transports Tb into an unconventional magnetic state with an anomalously high magnetic ordering temperature.