Observation of broken time-reversal symmetry with Andreev bound state tunneling spectroscopy

被引：22

作者：

Greene, LH ^{[1
]}

Covington, M ^{[1
]}

Aprili, M ^{[1
]}

Badica, E ^{[1
]}

Pugel, DE ^{[1
]}

机构：

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

来源：

PHYSICA B-CONDENSED MATTER | 2000年 / 280卷 / 1-4期

关键词：

Andreev bound states; broken time-reversal symmetry; order parameter; thin films; tunnel junctions spectroscopy; unconventional superconductivity;

D O I：

10.1016/S0921-4526(99)01549-5

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

Quasiparticle (QP) planar tunneling spectroscopy is used to investigate the density of states (DoS) of YBa2Cu2O7 (YBCO). Temperature, crystallographic orientation, doping, damage and magnetic field dependencies confirm that the observed zero-bias conductance peak (ZBCP) is an Andreev bound state (ABS), an intrinsic property of a d-wave superconducting order parameter (OP) at an interface. In zero applied field, the splitting of the ZBCP below similar to 8K confirms a near-surface phase transition into a superconducting state with spontaneously broken time-reversal symmetry (BTRS). Tunneling into the ABS provides a phase-sensitive spectroscopy that can be used to measure a variety of DoS properties in an unconventional superconductor. (C) 2000 Elsevier Science B.V. All rights reserved.

引用

页码：159 / 164

页数：6

共 79 条

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