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arXiv 0802.1179cond-mat.supr-con
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压力下$β$ -烧绿石AOs $_2$ O $_6$（A=Cs，Rb，K）的超导转变

Superconducting Transition in the $β$-Pyrochlore AOs$_2$O$_6$ (A=Cs, Rb, K) under Pressure

K. Miyoshi, Y. Takaichi, Y. Takamatsu, M. Miura, J. Takeuchi

备注：
4 pages, 4 figures, to be published in J. Phys. Soc. Jpn. Vol. 77, No. 4 (2008)
发表信息：
J. Phys. Soc. Jpn. 77, 043704 (2008)
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摘要：

通过对$β$ -烧绿石氧化物AOs $_2$ O $_6$（A=Cs（$T_{\rm c}$ =3.3 K），Rb（6.3 K）和K（9.6 K）在$P$ =10 GPa下的直流磁测量，确定了超导转变温度$T_{\rm c}$的压力依赖性.对于A=Rb和Cs，$T_{\rm c}$随着$P$的增加而增加，并且在$T_{\rm cm}$ $\sim$ 8.8 K处显示饱和，该温度被认为是AO $_2$ O $_6$中固有的$T_{\rm c}$的上限。相比之下，KOs $_2$ O $_6$的$T_{\rm c}-P$曲线显示在$P$ $\sim$ 0.5 GPa下$\sim$ 10 K的尖锐最大值，并且对于0 $\leq$ $P$ $\leq$ 1.5 GPa，$T_{\rm c}$高于$T_{\rm cm}$，这表明由于K离子的晃动而增强的超导电性。

英文摘要：

Pressure dependence of superconducting transition temperature $T_{\rm c}$ has been determined through the DC magnetic measurements under pressure up to $P$=10 GPa for $β$-pyrochlore oxides AOs$_2$O$_6$ with A=Cs ($T_{\rm c}$=3.3 K), Rb (6.3 K) and K (9.6 K). Both for A=Rb and Cs, $T_{\rm c}$ increases with increasing $P$ and shows a saturation at $T_{\rm cm}$$\sim$8.8 K, which is considered as the upper limit of $T_{\rm c}$ inherent in AOs$_2$O$_6$. In contrast, the $T_{\rm c}-P$ curve for KOs$_2$O$_6$ shows a sharp maximum of $\sim$10 K at $P$$\sim$0.5 GPa, and $T_{\rm c}$ is higher than $T_{\rm cm}$ for 0$\leq$$P$$\leq$1.5GPa, suggesting the enhanced superconductivity due to the rattling of K ions.

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