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.
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页码：S391 / S393
页数：3
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