Superconducting energy gap of La1.85Sr0.15CuO4 single crystals from break-junction tunneling

被引：25

作者：

Ekino, T ^{[1
]}

Doukan, T ^{[1
]}

Fujii, H ^{[1
]}

Nakamura, F ^{[1
]}

Sakita, S ^{[1
]}

Kodama, M ^{[1
]}

Fujita, T ^{[1
]}

机构：

[1] HIROSHIMA UNIV,FAC SCI,HIGASHIHIROSHIMA 739,JAPAN

来源：

PHYSICA C | 1996年 / 263卷 / 1-4期

关键词：

D O I：

10.1016/0921-4534(95)00714-8

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The break-junction tunneling technique has been applied to measure the superconducting gap of La1.85Sr0.15CuO4 single crystals with T-c = 33 K. Since this technique provides the cleanest junction interface, the influence of degraded surface layers can be avoided. The observed gap structures possess BCS-like characteristics with sharp gap peaks and very low leakage below the gap voltage. A straightforward interpretation of these features can be given by the s-wave symmetry of the pairing state. The ratio of 2 Delta/k(B)T(c) as a measure of the pairing strength is estimated to be 8.9 +/- 0.2.

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页码：249 / 252

页数：4

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