We have investigated the angular dependence of the resistivity and the critical current density in the magnetic field for YBa2Cu3O7-δ thin films. Angular dependence of the magnetoresistivity is found to follow a sin2 φ form expected for the Lorentz-force-driven flux motion model, although when the magnetic field is applied parallel to the direction of grain or twin boundaries, the resistivity drops are observed depending on the sample. In the angular dependence of the critical current density, asymmetry is observed with respect to φ = 180°, which may be due to surface pinning at the interface between the film and the substrate. However, its angular dependence is explained by the simple flux motion model in spite of asymmetry.
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Acknowledgements - This study is supported by the Ministry of Science and Technology, Republic of Korea. We would like to thank Dr Soon-Gul Lee for his helpful discussion, Dr Y.H. Lee for providing a Nb film, and Mr C.M. Ihm and Y.K. Song for their technical assistance.
All Science Journal Classification (ASJC) codes
- Condensed Matter Physics
- Materials Chemistry