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.

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页码：8680 / 8686

页数：7

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