Portal de Periódicos da CAPES

Power-Law I-V Characteristics in the Superconducting Transition Region of Bi-Sr-Ca-Cu-O Single Crystal under Magnetic Fields

1991; Institute of Physics; Volume: 30; Issue: 9B Linguagem: Inglês

10.1143/jjap.30.l1635

1347-4065

Yoichi Ando, Naofumi Motohira, K. Kitazawa, J. Takeya, S. Akita,

Quantum and electron transport phenomena

The resistive state in single-crystal Bi 2 Sr 2 CaCu 2 O y with field applied perpendicular to the c -axis has been studied to investigate the origin of the Lorentz-force-independent dissipation. It was observed that the current-voltage characteristics obey a power law in the higher current density region in our experiment ( J ≥20 A·cm -2 ), and that the power-law exponent and the resistivity show an unusual dependence on the magnetic field. These observations strongly suggest that a Kosterlitz-Thouless-type mechanism plays an essential role in the Lorentz-force-independent dissipation.