Magnetic phase diagram of untwinned YBa2Cu3Oy single crystals annealed in high pressure oxygen atmosphere

被引：8

作者：

Shibata, K

Nishizaki, T

Naito, T

Kobayashi, N

机构：

[1] Tohoku Univ, Inst Mat Res, Aoba Ku, Sendai, Miyagi 9808577, Japan

[2] Japan Sci & Technol Corp, CREST, Wako, Saitama 3320012, Japan

来源：

PHYSICA C | 1999年 / 317卷

关键词：

untwinned YBa2Cu3Oy single crystal; phase diagram; vortex lattice melting transition;

D O I：

10.1016/S0921-4534(99)00120-3

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Magnetization and resistivity for untwinned YBa2Cu3Oy single crystals with controlled oxygen contents were measured at high fields (H parallel to c) up to 27 T. With increasing the oxygen content above the optimum condition, the superconducting transition temperature T-c changed from similar or equal to 93 K to similar or equal to 88 K and the hysteresis width of the magnetization M(H) curve decreased. The resistivity measurement for the heavily overdoped sample showed a discontinuous jump which results from the first-order vortex lattice melting transition (VMLT) even at 26 T. The result indicates that the vortex pinning is strongly reduced for heavily overdoped sample and the oxygen vacancy has great influence on its phase diagram in untwinned YBa2Cu3Oy. (C) 1999 Elsevier Science B.V. All rights reserved.

引用

页码：540 / 542

页数：3

共 9 条

[1] New features in the vortex phase diagram of YBa2Cu3O7-delta [J].