Nanocrack junctions in unidirectionally twinned thin films of YBa2Cu3O7-δ on (001) NdGaO3

被引：21

作者：

Koren, G ^{[1
]}

Polturak, E

Levy, N

Deutscher, G

Zakharov, ND

机构：

[1] Technion Israel Inst Technol, Crown Ctr Supercond, IL-32000 Haifa, Israel

[2] Technion Israel Inst Technol, Dept Phys, IL-32000 Haifa, Israel

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

[4] Max Planck Inst Mikrostrukturphys, D-06120 Halle, Germany

来源：

APPLIED PHYSICS LETTERS | 1998年 / 73卷 / 25期

关键词：

D O I：

10.1063/1.122887

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We found unidirectional nanocracks in unidirectionally twinned films of YBa2Cu3O7-delta on NdGaO3 which are normal to the twin planes. In 70-250 nm thick films, transmission electron and atomic force microscopy show that these unidirectional nanocracks are found to be 1-2 mu m apart and have 2-4 nm width. Microbridges that cross these nanocracks behave as natural Josephson junctions. They show Shapiro steps under microwave irradiation and suppression of the critical current I-c. in magnetic fields. A very large in-plane anisotropy of the resistivities and I-c was observed and this was correlated with the nanocracks orientation, length, and him thickness. The observed anisotropy of I-c near T-c is shown to be consistent with a d+is wave symmetry of the order parameter in YBa2Cu3O7-delta. (C) 1998 American Institute of Physics. [S0003-6951(98)00151-X].

引用

页码：3763 / 3765

页数：3

共 13 条

[1] VOLTAGE DUE TO THERMAL NOISE IN DC JOSEPHSON EFFECT [J].

AMBEGAOKAR, V ;

HALPERIN, BI .

PHYSICAL REVIEW LETTERS, 1969, 22 (25) :1364-+

[2] 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

[3] EFFECT OF THERMAL NOISE ON CURRENT-VOLTAGE CHARACTERISTICS OF JOSEPHSON JUNCTIONS [J].

FALCO, CM ;

PARKER, WH ;

TRULLINGER, SE ;

HANSMA, PK .

PHYSICAL REVIEW B, 1974, 10 (05) :1865-1873

[4] 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

[5] THERMALLY ACTIVATED PHASE SLIPPAGE IN HIGH-TC GRAIN-BOUNDARY JOSEPHSON-JUNCTIONS [J].

GROSS, R ;

CHAUDHARI, P ;

DIMOS, D ;

GUPTA, A ;

KOREN, G .

PHYSICAL REVIEW LETTERS, 1990, 64 (02) :228-231

[6] INPLANE AND (C)OVER-CAP-AXIS MICROWAVE PENETRATION DEPTH OF BI2SR2CA1CU2O8+DELTA CRYSTALS [J].

JACOBS, T ;

SRIDHAR, S ;

LI, Q ;

GU, GD ;

KOSHIZUKA, N .

PHYSICAL REVIEW LETTERS, 1995, 75 (24) :4516-4519

[7] MICROCRACKS OBSERVED IN EPITAXIAL THIN-FILMS OF YBA2CU3O7-DELTA AND GDBA2CU3O7-DELTA [J].

KASTNER, G ;

HESSE, D ;

LORENZ, M ;

SCHOLZ, R ;

ZAKHAROV, ND ;

KOPPERSCHMIDT, P .

PHYSICA STATUS SOLIDI A-APPLIED RESEARCH, 1995, 150 (01) :381-394

[8] DC SPUTTER DEPOSITION OF YBA2CU3O7 THIN-FILMS FOR 2 SIDED COATING [J].

KOREN, G .

PHYSICA C, 1993, 209 (04) :369-372

[9] c-axis Josephson tunneling between YBa2Cu3O7-delta and Pb: Direct evidence for mixed order parameter symmetry in a high-T-c superconductor [J].

Kouznetsov, KA ;

Sun, AG ;

Chen, B ;

Katz, AS ;

Bahcall, SR ;

Clarke, J ;

Dynes, RC ;

Gajewski, DA ;

Han, SH ;

Maple, MB ;

Giapintzakis, J ;

Kim, JT ;

Ginsberg, DM .

PHYSICAL REVIEW LETTERS, 1997, 79 (16) :3050-3053

[10]

SHERER T, 1992, PHYSICA C, V197, P79

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