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Shear at twin domain boundaries in YBa2Cu3O7-x.
W A Caldwell1, N Tamura, R S Celestre
1Advanced Light Source, 1 Cyclotron Road, Berkeley, California 94720, USA.
Physical Review Letters
|July 13, 2004
Summary
Twin domains in YBa2Cu3O7-x exhibit shear strain at interfaces, not interiors. These findings support stress field pinning of magnetic flux vortices by twin domain boundaries.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Crystallography
Background:
- Yttrium barium copper oxide (YBa2Cu3O7-x) is a crucial high-temperature superconductor.
- Understanding its microstructure, particularly twin domains, is vital for optimizing superconducting properties.
- Twin domains significantly influence the material's mechanical and electromagnetic behavior.
Purpose of the Study:
- To investigate the microstructure and strain state within twin domains of YBa2Cu3O7-x.
- To determine the relationship between twin domain structure and internal stress.
- To explore the implications for magnetic flux pinning.
Main Methods:
- Synchrotron white-beam x-ray microdiffraction was employed.
- Laue diffraction peak splitting was analyzed to map twin domain structures.
- Strain analysis was performed on the twin domain interfaces and interiors.
Main Results:
- Twin domain interfaces are characterized by significant shear strain.
- The interior of twin domains shows minimal strain.
- Basal plane shear stresses at domain boundaries can surpass 100 MPa.
- Measurements align with established twin boundary orientation relationships.
Conclusions:
- The study elucidates the strain distribution within YBa2Cu3O7-x twin domains.
- Results confirm that twin domain boundaries create stress fields.
- These stress fields are effective in pinning magnetic flux vortices, enhancing superconducting performance.
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