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Updated: Jul 20, 2026

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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.
Abstract:
The microstructure and strain state of twin domains in YBa2Cu3O7-x are discussed based upon synchrotron white-beam x-ray microdiffraction measurements. Intensity variations of the fourfold twin splitting of Laue diffraction peaks are used to determine the twin domain structure. Strain analysis shows that interfaces between neighboring twin domains are strained in shear, whereas the interior of these domains are regions of low strain. These measurements are consistent with the orientation relationships of twin boundaries within and across domains and show that basal plane shear stresses can exceed 100 MPa where twin domains meet. Our results support stress field pinning of magnetic flux vortices by twin domain boundaries.
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