Tunneling spectroscopy of the superconducting energy gap in RNi(2)B(2)C (R=Y and Lu)

被引：64

作者：

Ekino, T ^{[1
]}

Fujii, H ^{[1
]}

Kosugi, M ^{[1
]}

Zenitani, Y ^{[1
]}

Akimitsu, J ^{[1
]}

机构：

[1] AOYAMA GAKUIN UNIV,DEPT PHYS,TOKYO 157,JAPAN

来源：

PHYSICAL REVIEW B | 1996年 / 53卷 / 09期

关键词：

D O I：

10.1103/PhysRevB.53.5640

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Superconducting energy gap in RNi(2)B(2)C (R=Y and Lu) has been investigated using a break-junction tunneling technique. The observed differential conductance dI/dV is well described by the BCS density of states with a small lifetime broadening parameter. We have found small gap values for the local low-T-c phases in addition to the bulk T-c of 15.6-16.6 K. The gap value of 2 Delta = 4.5 meV with T-c = 15 K gives the BCS ratio of 2 Delta/k(B)T(c) = 3.5, which is kept constant down to the observed lowest T-c of 4.6 K. These results give clear evidence for the BCS mechanism of superconductivity for these compounds.

引用

页码：5640 / 5649

页数：10

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