Mechanisms for enhanced supercurrent across meandered grain boundaries in high-temperature superconductors

被引：36

作者：

Feldmann, D. M.

Holesinger, T. G.

Feenstra, R.

Cantoni, C.

Zhang, W.

Rupich, M.

Li, X.

Durrell, J. H.

Gurevich, A.

Larbalestier, D. C.

机构：

[1] Los Alamos Natl Lab, Los Alamos, NM 87545 USA

[2] Univ Wisconsin, Madison, WI 53706 USA

[3] Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA

[4] Univ Cambridge, Cambridge CB2 3QZ, England

来源：

JOURNAL OF APPLIED PHYSICS | 2007年 / 102卷 / 08期

基金：

英国工程与自然科学研究理事会;

关键词：

D O I：

10.1063/1.2800255

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

It has been well established that the critical current density J(c) across grain boundaries (GBs) in high-temperature superconductors decreases exponentially with misorientation angle theta beyond similar to 2 degrees-3 degrees. This rapid decrease is due to a suppression of the superconducting order parameter at the grain boundary, giving rise to weakly pinned Abrikosov-Josephson (AJ) vortices. Here we show that if the GB plane meanders, this exponential dependence no longer holds, permitting greatly enhanced Jc values: up to six times at 0 T and four times at 1 T at theta similar to 4 degrees-6 degrees. This enhancement is due to an increase in the current-carrying cross section of the GBs and the appearance of short AJ vortex segments in the GB plane, confined by the interaction with strongly pinned Abrikosov (A) vortices in the grains. (C) 2007 American Institute of Physics.

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共 21 条

[11] Enhanced supercurrent density in polycrystalline YBa2Cu3O7-δ at 77 K from calcium doping of grain boundaries [J].

Hammerl, G ;

Schmehl, A ;

Schulz, RR ;

Goetz, B ;

Bielefeldt, H ;

Schneider, CW ;

Hilgenkamp, H ;

Mannhart, J .

NATURE, 2000, 407 (6801) :162-164

[12] Grain boundaries in high-Tc superconductors [J].

Hilgenkamp, H ;

Mannhart, J .

REVIEWS OF MODERN PHYSICS, 2002, 74 (02) :485-549

[13] Liquid mediated growth and the bimodal microstructure of YBa2Cu3O7-δ films made by the ex situ conversion of physical vapor deposited BaF2 precursors [J].

Holesinger, TG ;

Arendt, PN ;

Feenstra, R ;

Gapud, AA ;

Specht, ED ;

Feldmann, DM ;

Larbalestier, DC .

JOURNAL OF MATERIALS RESEARCH, 2005, 20 (05) :1216-1233

[14] High-Tc superconducting materials for electric power applications [J].

Larbalestier, D ;

Gurevich, A ;

Feldmann, DM ;

Polyanskii, A .

NATURE, 2001, 414 (6861) :368-377

[15] LIMITS OF THE CRITICAL CURRENT-DENSITY OF POLYCRYSTALLINE HIGH-TEMPERATURE SUPERCONDUCTORS BASED ON THE CURRENT TRANSPORT-PROPERTIES OF SINGLE GRAIN-BOUNDARIES [J].

MANNHART, J ;

TSUEI, CC .

ZEITSCHRIFT FUR PHYSIK B-CONDENSED MATTER, 1989, 77 (01) :53-59

[16] METALORGANIC DEPOSITION OF HIGH-JCBA2YCU3O7-X THIN-FILMS FROM TRIFLUOROACETATE PRECURSORS ONTO (100) SRTIO3 [J].

MCINTYRE, PC ;

CIMA, MJ ;

NG, MF .

JOURNAL OF APPLIED PHYSICS, 1990, 68 (08) :4183-4187

[17] Metalorganic deposition of YBCO films for second-generation high-temperature superconductor wires [J].

Rupich, MW ;

Verebelyi, DT ;

Zhang, W ;

Kodenkandath, T ;

Li, XP .

MRS BULLETIN, 2004, 29 (08) :572-578

[18] Direct evidence for negative grain boundary potential in Ca-doped and undoped YBa2Cu3O7-x -: art. no. 195502 [J].

Schofield, MA ;

Beleggia, M ;

Zhu, YM ;

Guth, K ;

Jooss, C .

PHYSICAL REVIEW LETTERS, 2004, 92 (19) :195502-1

[19] Electromagnetic, atomic structure and chemistry changes induced by Ca-doping of low-angle YBa2Cu3O7-δ grain boundaries [J].

Song, XY ;

Daniels, G ;

Feldmann, DM ;

Gurevich, A ;

Larbalestier, D .

NATURE MATERIALS, 2005, 4 (06) :470-475

[20] Low angle grain boundary transport in YBa2Cu3O7-δ coated conductors [J].

Verebelyi, DT ;

Christen, DK ;

Feenstra, R ;

Cantoni, C ;

Goyal, A ;

Lee, DF ;

Paranthaman, M ;

Arendt, PN ;

DePaula, RF ;

Groves, JR ;

Prouteau, C .

APPLIED PHYSICS LETTERS, 2000, 76 (13) :1755-1757