Anomalous flux pinning in β-pyrochlore oxide superconductor KOs2O6

被引：11

作者：

Hiroi, Z ^{[1
]}

Yonezawa, S ^{[1
]}

机构：

[1] Univ Tokyo, Inst Solid State Phys, Kashiwa, Chiba 2778581, Japan

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 2006年 / 75卷 / 04期

关键词：

superconductivity; flux pinning; intrinsic pinning; beta-pyrochlore oxide; KOs2O6;

D O I：

10.1143/JPSJ.75.043701

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The superconducting transition of the beta-pyrochlore oxide KOs2O6 with T-c = 9.60 K is studied by resistivity measurements under various magnetic fields using a high-quality single crystal. The reentrant behavior of superconductivity is observed near T-c in low magnetic fields below 2T. The recovered resistance probably due to flux flow exhibits an anomalous angle dependence, indicating that flux pinning is enhanced in magnetic fields along certain crystallographic directions such as [110], [001], and [112]. It is suggested that there is an intrinsic pinning mechanism coming from the specific crystal structure of the beta-pyrochlore oxide.

引用

页数：4

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