Pinning of Vortices at Twin Boundaries in YBa2Cu3O7−x Single Crystals

A YBCO single crystal having only one twin domain with very uniform twin spacing is investigated by torque magnetometry with field rotation parallel to a {110} plane which is either perpendicular or parallel to twin planes. Experimental data are analyzed with respect to irreversible and reversible torque contributions. From the latter one an anisotropy ratio γ = 9 is determined. Several rotational hysteresis loss contributions are identified, the most remarkable of which are very anisotropic losses due to intrinsic pinning and twin pinning. By using different measuring geometries it is shown that twin boundaries do not assist in the intrinsic pinning process as it was suggested in the literature. Isotropic losses are ascribed to impurity atoms. Viscous losses arising during vortex motion are small in comparison to all other losses. The results are discussed in terms of recent pinning models from literature.

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Vortex Pinning by (001) Planes and by Twin Boundaries in YBCO Single Crystals

Hergt

Andrä

Hiergeist

et al. 1992

Phys. Stat. Sol. (a)

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The influence of several impurities on the microstructure and superconducting properties of YBa2Cu3O7−x single crystals

et al. 1991

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Vortex pinning by twin boundaries and CuO-planes in HTSC single crystals investigated by torque magnetometry

Hergt

Andrä

Fischer

1991

Physica C: Superconductivity

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Pinning of Vortices at Twin Boundaries in YBa2Cu3O7−x Single Crystals

Cited by 6 publications

References 6 publications

Vortex Pinning by (001) Planes and by Twin Boundaries in YBCO Single Crystals

Vortex Pinning by (001) Planes and by Twin Boundaries in YBCO Single Crystals

The influence of several impurities on the microstructure and superconducting properties of YBa2Cu3O7−x single crystals

Vortex pinning by twin boundaries and CuO-planes in HTSC single crystals investigated by torque magnetometry

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