Low Temperature Physics: 34, 503 (2008); https://doi.org/10.1063/1.2957001 (5 pages)
Fizika Nizkikh Temperatur: Volume 34, Number 7 (July 2008), p. 639-644    ( to contents , go back )

Dislocation description of twins in high-temperature superconductor YBa2Cu3O7-d

V.S. Boyko

Physics Department, New York City College of Technology of the City University of New York, Brooklyn, NY, 11201, USA
E-mail: vboyko@CityTech.Cuny.Edu
pos Анотація:

Received January 11, 2008

Abstract

The thin twins theory consistently applied to the dislocation description of twins in the high-temperature superconductor YBa2Cu3O7-d (YBCO). Quantitative analysis of the twin shape shows an agreement with theoretical consideration and gives new method to evaluate the twin boundary energy gtw. Friction stress Sfr acting on a twinning dislocation is also determined. The formation of a twin and twin microstructures are analyzed. The principles of microstructure design by twinning in YBCO crystals for enhanced Jc at high magnetic fields are discussed.

PACS: 74.72.Bk Y-based cuprates;
PACS: 74.25.Qt Vortex lattices, flux pinning, flux creep;
PACS: 61.72.Lk Linear defects: dislocations, disclinations;
PACS: 61.72.Mm Grain and twin boundaries.

Key words: twin boundaries, dislocations, flux pinning.

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