Abstract
Measurements of the imaginary part of the ac magnetic susceptibility of single crystals and melt-textured samples of YBa2Cu3Ox (YBCO) at T=77 K in a magnetic field ranging between 1 and 20 kOe are reported. If the dc magnetic field H dc is rotated in the ab plane of the sample, the magnetic susceptibility and critical current density j c have peaks corresponding to the magnetic field aligned with twin boundaries. Peaks in the curve of j c versus magnetic field are observed at angles corresponding to these peaks, where \(j_c \propto \sqrt {H_{dc} } \) AH dc in a wide range of magnetic fields. The results have been interpreted in terms of the theory describing twin boundaries as a system of quasi-planar pinning sites. The pinning is strong if the elastic displacements of flux lines are of the order of the vortex lattice constant d f. These displacements decrease with the magnetic field because of the decrease in d f, and the contribution of the elastic energy to the Gibbs potential is reduced accordingly, which is the cause of the peak effect.
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Zh. Éksp. Teor. Fiz. 111, 2158–2174 (June 1997)
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Voloshin, I.F., Kalinov, A.V., Fisher, L.M. et al. Pinning by twin boundaries and peak effect in YBaCuO high-T c superconductors. J. Exp. Theor. Phys. 84, 1177–1185 (1997). https://doi.org/10.1134/1.558256
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DOI: https://doi.org/10.1134/1.558256