A STUDY OF THE SPLIT TRANSITION IN YBA2CU3O7-DELTA BY SPECIFIC-HEAT AND RESISTIVITY MEASUREMENTS

被引：41

作者：

LORAM, JW

COOPER, JR

MIRZA, KA

机构：

来源：

SUPERCONDUCTOR SCIENCE & TECHNOLOGY | 1991年 / 4卷

关键词：

D O I：

10.1088/0953-2048/4/1S/116

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Fully oxygenated ceramic YBa2Cu3O7-delta (delta approximately 0) exhibits a double transition with a sharp specific heat peak at 88K (T(c1)) and a mean field like step at 92.5K (T(c)) indicative of a multicomponent order parameter. With small increase in delta, T(c) - T(c1) decreases systematically (and reversibly) and is zero at delta = 0.05. Several interpretations are considered and we conclude that the evidence favours an unconventional pair interaction. From a preliminary analysis of the fluctuation component of the specific heat and resistivity we find a fourfold decrease in coherence volume as delta increases from 0 to 0.1.

引用

页码：S391 / S393

页数：3

共 10 条

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