FLUCTUATION SPECIFIC-HEAT AND THERMAL-EXPANSION OF YBACUO AND DYBACUO

被引:48
作者
SCHNELLE, W
BRAUN, E
BROICHER, H
DOMEL, R
RUPPEL, S
BRAUNISCH, W
HARNISCHMACHER, J
WOHLLEBEN, D
机构
[1] II. Physikalisches Institut der Universität zu Köln, D-5000 Köln 41
来源
PHYSICA C | 1990年 / 168卷 / 5-6期
关键词
D O I
10.1016/0921-4534(90)90063-K
中图分类号
O59 [应用物理学];
学科分类号
摘要
We present high resolution specific heat measurements and thermal expansion data of YBa2Cu3O7-δ polycrystalline samples in the temperature range 20-300 K. The specific heat anomaly at Tc shows strong deviations from mean field behavior due to superconducting fluctuations. The fluctuation behaviour seems to be more complicated than simply Gaussian. The thermal expansion shows clear anomalies at the Tc's of the samples. Additionally we give an estimate of the Grüneisen functions and discuss data of the low field DC Meissner effect in connection with the grain structure of the samples. © 1990.
引用
收藏
页码:465 / 474
页数:10
相关论文
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