CeRu $_2$ Al $_{10}$:与URu $_2$ Si $_2$的相似性
Magneto-transport properties of CeRu$_2$Al$_{10}$: Similarities to URu$_2$Si$_2$
摘要:
本文报道了近藤半导体化合物CeRu $_2$ Al $_{10}$的磁输运性质,重点研究了其在低于$T_0$ = 27 K时的奇异相.在该相中,过量的热导率$κ$出现并逐渐被磁场抑制,与在URu $_2$ Si $_2$的隐序相中观察到的那些非常相似。我们的分析表明,低能量的磁激发是最有可能的起源,也提出了URu $_2$ Si $_2$最近,尽管大大减少了磁矩。同样,其他输运性质,如电阻率,热电势和能斯特效应表现出明显的特征,表征了$T_0$之上和之下非常不同的电荷动力学,也与URu $_2$ Si $_2$有相似之处。鉴于这两种化合物中有序相的奇异性质,是否存在对所有这些观察结果的统一解释似乎非常有趣。
英文摘要:
We report on magneto-transport properties of the Kondo semiconducting compound CeRu$_2$Al$_{10}$, focusing on its exotic phase below $T_0$ = 27 K. In this phase, an excess thermal conductivity $κ$ emerges and is gradually suppressed by magnetic field, strikingly resembling those observed in the hidden-order phase of URu$_2$Si$_2$. Our analysis indicates that low-energy magnetic excitation is the most likely origin, as was also proposed for URu$_2$Si$_2$ recently, despite the largely reduced magnetic moments. Likewise, other transport properties such as resistivity, thermopower and Nernst effect exhibit distinct features characterizing the very different charge dynamics above and below $T_0$, sharing similarities to URu$_2$Si$_2$, too. Given the exotic nature of the ordered phases in both compounds, whether a unified interpretation to all these observations exists appears to be extremely interesting.
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