Thickness independence of field-induced time-reversal symmetry breaking in YBa2Cu3O7-δ thin films -: art. no. 092509

被引：7

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：

PHYSICAL REVIEW B | 2001年 / 64卷 / 09期

关键词：

D O I：

10.1103/PhysRevB.64.092509

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We have measured the field dependence of the zero-bias conductance peak (ZBCP) of tunnel junctions prepared on (110) oriented YBa2Cu3O7-delta films of various thickness. We have found that the field splitting of the ZBCP, believed to be due to the time reversal symmetry breaking (TRSB) of Andreev surface-bound states, is independent of film thickness. This rules out that Meissner screening currents are at the origin of TRSB. We conclude that TRSB must. instead, be due to a field-induced modification of the order parameter. Different possibilities involving an imaginary component are discussed.

引用

收藏

页数：3

相关论文

共 17 条

[1] Doppler shift of the Andreev bound states at the YBCO surface [J].

Aprili, M ;

Badica, E ;

Greene, LH .

PHYSICAL REVIEW LETTERS, 1999, 83 (22) :4630-4633

[2]

BUCKEL W, 1991, SUPERCONDUCTIVITY, P123

[3] Observation of surface-induced broken time-reversal symmetry in YBa2Cu3O7 tunnel junctions [J].

Covington, M ;

Aprili, M ;

Paraoanu, E ;

Greene, LH ;

Xu, F ;

Zhu, J ;

Mirkin, CA .

PHYSICAL REVIEW LETTERS, 1997, 79 (02) :277-280

[4] [110] tunneling under applied magnetic fields into Y1Ba2Cu3O7-δ:: Possible evidence for a field-induced idxy gap component [J].

Dagan, Y ;

Krupke, R ;

Deutscher, G .

EUROPHYSICS LETTERS, 2000, 51 (01) :116-121

[5] Determination of the superconducting gap in YBa2Cu3O7-δ by tunneling experiments under magnetic fields [J].

Dagan, Y ;

Krupke, R ;

Deutscher, G .

PHYSICAL REVIEW B, 2000, 62 (01) :146-149

[6] Field induced and spontaneous sub-gap in [110] and [100] oriented YBCO films:: indication for a dx(2)-y(2)+idxy order parameter [J].

Deutscher, G ;

Dagan, Y ;

Kohen, A ;

Krupke, R .

PHYSICA C, 2000, 341 :1629-1632

[7] Penetration depth variation in high quality YBaCuO thin films [J].

Farber, E ;

Djordjevic, S ;

Bontemps, N ;

Durand, O ;

Contour, JP ;

Deutscher, G .

JOURNAL OF LOW TEMPERATURE PHYSICS, 1999, 117 (3-4) :515-519

[8] Tunneling into current-carrying surface states of high-T-c superconductors [J].

Fogelstrom, M ;

Rainer, D ;

Sauls, JA .

PHYSICAL REVIEW LETTERS, 1997, 79 (02) :281-284

[9] MIDGAP SURFACE-STATES AS A NOVEL SIGNATURE FOR D(X(A)(2)-X(B)(2))-WAVE SUPERCONDUCTIVITY [J].

HU, CR .

PHYSICAL REVIEW LETTERS, 1994, 72 (10) :1526-1529

[10] ORIGIN OF ZERO-BIAS CONDUCTANCE PEAKS IN HIGH-T-C SUPERCONDUCTORS [J].

KASHIWAYA, S ;

TANAKA, Y ;

KOYANAGI, M ;

TAKASHIMA, H ;

KAJIMURA, K .

PHYSICAL REVIEW B, 1995, 51 (02) :1350-1353