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arXiv 1502.01785cond-mat.str-elcond-mat.mtrl-sci
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Tb ~ 141 GPa磁有序温度的异常压力依赖性:与Gd和Dy的比较

Anomalous Pressure Dependence of magnetic Ordering Temperature in Tb to 141 GPa: Comparison with Gd and Dy

J. Lim, G. Fabbris, D. Haskel, J. S. Schilling

摘要:

在以前的研究中,发现Dy的磁有序温度$T_{\text{o}}$的压力依赖性在高于其体积塌陷压力73 GPa时表现出急剧增加,似乎在157 GPa时达到远高于环境的温度。在寻找第二种这样的镧系元素时,在3.8 - 295 K的温度范围内对相邻的Tb至141 GPa进行电阻率测量。低于Tb的体积塌陷压力53 GPa,压力依赖性$T_{\text{o}}(P)$反映了Dy和Gd的压力依赖性。然而,在较高的压力下,Tb的$T_{\text{o}}(P)$变得高度反常。这一结果,连同稀释的Tb离子在Y中的超导性的非常强的抑制,表明极压运输Tb到一个非常规的磁状态,具有异常高的磁有序温度。

英文摘要:

In previous studies the pressure dependence of the magnetic ordering temperature $T_{\text{o}}$ 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 $T_{\text{o}}(P)$ mirrors that of both Dy and Gd. However, at higher pressures $T_{\text{o}}(P)$ 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.

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