Angular dependent transport studies in the mixed state of YBa2Cu3O7−y and Bi2Sr2CaCu2O8+y

✍ Scribed by Yasuhiro Iye; Sigeru Nakamura; Tsuyoshi Tamegai; Takahito Terashima; Kazunuki Yamamoto; Yoshichika Bando

• Publisher: Elsevier Science
• Year: 1990
• Tongue: English
• Weight: 779 KB
• Volume: 166
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/0921-4534(90)90553-q

✦ Synopsis

Precise angular dependent transport measurements have been carried out on thin film samples of YBazCu@_, and BizSrzCaCu208+, in their magnetic field induced resistive state. In the epitaxial YBa&u30,_,tilms, angular dependent resistivity exhibits features associated with the ab-plane anisotropy and also the influence of twin boundaries.

Observation of transverse resistivity comparable in size with the longitudinal resistivity gives strong evidence for flux dynamics as the essential mechanism of energy dissipation in the mixed state. Dependence on the relative angle between transport current and magnetic field is observed in YBa2Cu307_-y particularly clearly in the high current density case and is qualitatively consistent with the Lorentz-forcedriven flux motion. This is to be contrasted with the case of Bi2Sr2CaCu208+y in which the dissipation is independent of the current direction. A model for the flux dynamics in highly anisotropic layered superconductors is discussed as a possible interpretation of the anomalous Lorentz force independence in the latter system.