DETERMINATION OF THE GAP IN BI-SR-CA-CU-O (2/2/1/2-PHASE) SUPERCONDUCTING WHISKERS BY TUNNELING SPECTROSCOPY

被引：0
作者：
BORISOVA, IA
PONOMAREV, YG
RAKHIMOV, KT
SUDAKOVA, MV
TSOKUR, EB
SHCHERBAKOV, NA
YARYGIN, AV
KRAAK, W
KRAPF, A
OSKINA, TE
TRETYAKOV, YD
机构：
[1] HUMBOLDT UNIV BERLIN, O-1086 BERLIN, GERMANY
[2] MV LOMONOSOV MOSCOW STATE UNIV, FAC CHEM, MOSCOW 117234, RUSSIA
来源：
JETP LETTERS | 1994年 / 59卷 / 05期
关键词：
D O I：
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中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
The current-voltage characteristics of break junctions in Bi-Sr-Ca-Cu-O whiskers (the 2:2:1:2 phase), with a transition temperature 60 less-than-or-equal-to T(c) less-than-or-equal-to 81 K, have been studied experimentally. These I-V characteristics have a gap structure which is easily reproducible. From it one can determine the gap parameter DELTA fairly accurately. In the interval of transition temperatures T(c) studied, the ratio 2DELTA(0)/kT(c) for the Bi-Sr-Ca-Cu-O (2:2:1:2) whiskers is 7.1 +/- 0.2. The temperature dependence of the gap, DELTA(T), agrees satisfactorily with the formal BCS theory.
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页码：357 / 362
页数：6
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