Evolution of vortex phase diagram with oxygen-doping in Bi2Sr2CaCu2O8+y single crystals

被引：80

作者：

Ooi, S ^{[1
]}

Shibauchi, T ^{[1
]}

Tamegai, T ^{[1
]}

机构：

[1] Univ Tokyo, Dept Appl Phys, Bunkyo Ku, Tokyo 113, Japan

来源：

PHYSICA C | 1998年 / 302卷 / 04期

基金：

日本学术振兴会;

关键词：

vortex lattice melting; peak effect; Bi2Sr2CaCu2O8+y; micro-Hall-probe;

D O I：

10.1016/S0921-4534(98)00215-9

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We studied the vortex phase diagram in Bi2Sr2CaCu2O8+y with oxygen-doping by using micro-Hall-probes. The field B-s, where the magnetization steps occur, increases with oxygen concentrations. In addition to this, we found that oxygen doping makes the entropy change smaller. The magnetization steps were completely suppressed by further doping, while the magnetization peak was observed at high temperatures, whose temperature dependence is similar to B-s(T). Moreover, the peak field B-p at low temperatures shows pronounced re-entrant behavior in highly overdoped samples. All these features in the evolution of phase diagram can be explained by taking account of disorders as well as the decrease in the anisotropy due to oxygen-doping. (C) 1998 Elsevier Science B.V. All rights reserved.

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页码：339 / 345

页数：7

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