Torque Study of Layered Superconducting OxideBi2Sr2CaCu2O8+δSingle Crystal
- 15 October 1991
- journal article
- letter
- Published by Physical Society of Japan in Journal of the Physics Society Japan
- Vol. 60 (10) , 3226-3229
- https://doi.org/10.1143/jpsj.60.3226
Abstract
Magnetic anisotropy of layered superconducting oxide Bi 2 Sr 2 CaCu 2 O 8+δ single crystal was investigated by torque measurements at 77 K. A hysteresis loop with a sharp cusp was found for the magnetic fields below about 6 kOe close to the ab -plane. It can be satisfactorily explained by assuming that the component of diamagnetic moment perpendicular to the ab -plane is induced by the applied external field. In fact, the field and angular dependence of the cusp is ruled well by the relation H cos θ= H c P , where H c P is the critical field perpendicular to the ab -plane at which the flux-pinning decreases abruptly with increasing field.Keywords
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