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

doi:10.1143/JPSJ.77.043704

paper

Superconducting Transition in the $β$ -Pyrochlore AOs $_{2}$ O $_{6}$ (A=Cs, Rb, K) under Pressure

arXiv:0802.1179 · doi:10.1143/JPSJ.77.043704

Abstract

Pressure dependence of superconducting transition temperature $T_{c}$ 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 ( $T_{c}$ =3.3 K), Rb (6.3 K) and K (9.6 K). Both for A=Rb and Cs, $T_{c}$ increases with increasing $P$ and shows a saturation at $T_{cm}$ $\sim$ 8.8 K, which is considered as the upper limit of $T_{c}$ inherent in AOs $_{2}$ O $_{6}$ . In contrast, the $T_{c} - P$ curve for KOs $_{2}$ O $_{6}$ shows a sharp maximum of $\sim$ 10 K at $P$ $\sim$ 0.5 GPa, and $T_{c}$ is higher than $T_{cm}$ for 0 $\leq$ $P$ $\leq$ 1.5GPa, suggesting the enhanced superconductivity due to the rattling of K ions.

arXiv comment4 pages, 4 figures, to be published in J. Phys. Soc. Jpn. Vol. 77, No. 4 (2008)

Superconducting Transition in the $β$ -Pyrochlore AOs $_{2}$ O $_{6}$ (A=Cs, Rb, K) under Pressure

Abstract

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Superconducting Transition in the β-Pyrochlore AOs2​O6​ (A=Cs, Rb, K) under Pressure

Abstract

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Cited by in corpus (9)

Superconducting Transition in the $β$ -Pyrochlore AOs $_{2}$ O $_{6}$ (A=Cs, Rb, K) under Pressure