Tunneling spectroscopy of superconducting Nd1.85Ce0.15CuO4-δ

被引：109
|
作者：
Kashiwaya, S
Ito, T
Oka, K
Ueno, S
Takashima, H
Koyanagi, M
Tanaka, Y
Kajimura, K
机构：
[1] Electrotech Lab, Tsukuba, Ibaraki 305, Japan
[2] Univ Tsukuba, Tsukuba, Ibaraki 305, Japan
[3] Niigata Univ, Niigata 95021, Japan
来源：
PHYSICAL REVIEW B | 1998年 / 57卷 / 14期
关键词：
D O I：
10.1103/PhysRevB.57.8680
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The superconducting electronic states of Nd1.85Ce0.15CuO4-delta (NCCO) are studied by applying the phase-sensitive capability of tunneling spectroscopy. Unlike the YBa2Cu3O7-delta cases, the conductance spectra measured on (100)-, (110)- and (001)-oriented surfaces showed V-shaped gap structures, and no zero-bias conductance peaks were observed even around steps on the surfaces. The present results reject the possibility of d(x2-y2)-wave and d(xy)-wave symmetries for the pair potential in NCCO. The experimental spectra are well fitted to theoretical curves of anisotropic s-wave symmetry with a large smearing factor.
引用
收藏
页码：8680 / 8686
页数：7
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