SPECIFIC-HEAT AND THERMAL-EXPANSION OF THE BI AND TL HIGH-TEMPERATURE SUPERCONDUCTORS NEAR TC

被引:34
作者
BRAUN, E
SCHNELLE, W
BROICHER, H
HARNISCHMACHER, J
WOHLLEBEN, D
ALLGEIER, C
REITH, W
SCHILLING, JS
BOCK, J
PREISLER, E
VOGT, GJ
机构
[1] HOECHST AG, W-5030 HURTH, GERMANY
[2] UNIV CALIF LOS ALAMOS SCI LAB, CERAM SCI & TECHNOL GRP, LOS ALAMOS, NM 87545 USA
[3] UNIV MUNICH, SEKT PHYS, W-8000 MUNICH 40, GERMANY
来源
ZEITSCHRIFT FUR PHYSIK B-CONDENSED MATTER | 1991年 / 84卷 / 03期
关键词
D O I
10.1007/BF01314005
中图分类号
O469 [凝聚态物理学];
学科分类号
070205 ;
摘要
We present measurements of the specific heat and of the thermal expansion of the most prominent phases of the Bi and Tl high temperature superconductors (Bi-2212, Bi-2223, Tl-2212, Tl-2223) in the neighbourhood of T(c). In all these systems we observe small but sharp anomalies which have very little similarity with the mean field jump found in the conventional superconductors. The analysis of these anomalies shows clear evidence for the presence of strong fluctuations of the order parameter. For temperatures more than almost-equal-to 5 K away from T(c), 2D Gaussian fluctuations are found, while within +/- 5 K of T(c) the fluctuation contribution is best fitted by critical fluctuations. The shape of the thermal expansion anomalies is similar to that of the specific heat. Combination of both measurements predicts dT(c)/dp almost-equal-to + 0.2 K/kbar for Bi- and Tl-2223 systems.
引用
收藏
页码:333 / 341
页数:9
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