On the origin of time reversal symmetry breaking in Y1-yCayBa2Cu3O7-x

被引：14

作者：

Dagan, Y ^{[1
]}

Deutscher, G ^{[1
]}

机构：

[1] Tel Aviv Univ, Raymond & Beverly Sackler Fac Exact Sci, Sch Phys & Astron, IL-69978 Tel Aviv, Israel

来源：

EUROPHYSICS LETTERS | 2002年 / 57卷 / 03期

关键词：

D O I：

10.1209/epl/i2002-00480-8

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We have studied the Zero-Bias Conductance Peak (ZBCP) of the tunneling conductance measured on ( 1,1,0)-oriented Y1-yCayBa2Cu3O7-x thin films as a function of doping and of magnetic field. A spontaneous (zero field) split of the ZBCP was observed only in overdoped samples (either by O or by Ca). The magnitude of this split was found to be linear in doping. All samples exhibited a magnetic-field splitting, also strongly doping dependent. The field susceptibility chi =ddelta/dH\H-->0 diverges at the point at which spontaneous ZBCP splitting occurs, its inverse value, chi(-1), following a linear doping dependence on both the underdoped and overdoped sides. We discuss these results in terms of recent theoretical models of Time Reversal Symmetry Breaking (TRSB)

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页码：444 / 450

页数：7

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