Evidence for surface Andreev bound states in cuprate superconductors from penetration depth measurements

被引：35

作者：

Carrington, A ^{[1
]}

Manzano, F

Prozorov, R

Giannetta, RW

Kameda, N

Tamegai, T

机构：

[1] Univ Leeds, Dept Phys & Astron, Leeds LS2 9JT, W Yorkshire, England

[2] Univ Bristol, HH Wills Phys Lab, Bristol BS8 1TL, Avon, England

[3] Univ Illinois, Dept Phys, Urbana, IL 61801 USA

[4] Univ Tokyo, Dept Appl Phys, Bunkyo Ku, Tokyo 1138656, Japan

来源：

PHYSICAL REVIEW LETTERS | 2001年 / 86卷 / 06期

关键词：

D O I：

10.1103/PhysRevLett.86.1074

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Tunneling and theoretical studies have suggested that Andreev bound states form at certain surfaces of unconventional superconductors. Through studies of the temperature and field dependence of the in-plane magnetic penetration depth lambda (ab) at low temperature, we have found strong evidence for the presence of these states in clean single crystal YBCO and BSCCO. Crystals cut to expose (110) surfaces show a strong upturn in lambda (ab) at around 7 K, when the field is oriented along the c axis. In YBCO this upturn is completely suppressed by a field of similar to0.1 T.

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页码：1074 / 1077

页数：4

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