Novel Vortex Distribution in the β-Pyrochlore Superconductor KOs2O6

被引：0

作者：

Shibauchi, T. ^{[1
]}

Konczykowski, M.

van der Beek, C. J.

Okazaki, R. ^{[1
]}

Matsuda, Y. ^{[1
]}

Yamaura, J.

Nagao, Y.

Hiroi, Z.

机构：

[1] Kyoto Univ, Dept Phys, Sakyo Ku, Kyoto 6068502, Japan

来源：

25TH INTERNATIONAL CONFERENCE ON LOW TEMPERATURE PHYSICS (LT25), PT 5A: SUPERCONDUCTIVITY | 2009年 / 150卷 / 5a期

关键词：

Electron-phonon interactions - Potassium compounds - Single crystals - Superconducting materials;

D O I：

10.1088/1742-6596/150/5/052233

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

By utilizing the micro-Hall probe array, we study the superconducting and the vortex states in a single crystal of KOs(2)O(6) near the first-order transition at T(p) similar to 8 K, which is associated with a change in the rattling motion of K ions. We show that below the first-order transition, the lower critical field exhibits a distinct decrease, suggesting that the electron-phonon coupling is weakened below the transition. At high magnetic fields, the local magnetization shows an unexpectedly large jump at T(p) with a sign change near the sample edges. Our results demonstrate a novel redistribution of vortices whose energy is reduced abruptly below the first-order transition at T(p).

引用

页数：4

共 18 条

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