Vortices and the mixed state of ultrathin Bi films

Details Vortices and the mixed state of ultrathin Bi films Vortices and the mixed state of ultrathin Bi films

2002-09-02

arxiv.org/abs/cond-mat/0209026v1

Physics

Condensed Matter

Superconductivity

Submitted to LT23 Proceedings

Scientific paper

10.1016/S0921-4534(02)02652-7

Current-voltage (I-V) characteristics of quench condensed, superconducting, ultrathin Bi films in a magnetic field are reported. These show hysteresis for all films, grown both with and without thin Ge underlayers. Films on Ge underlayers, close to superconductor-insulator transition, show a peak in the critical current, indicating a structural transformation of the vortex solid. These underlayers, used to make the films more homogeneous, are found to be more effective in pinning the vortices. The upper critical fields ($B_{c2}$) of these films are determined from the resistive transitions in perpendicular magnetic field. The temperature dependence of the upper critical field is found to differ significantly from Ginzburg-Landau theory, after modifications for disorder.

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