Sambandamurthy, G and Gupta, Das K and Soman, Swati S and Chandrasekhar, N (2003) Vortices and the mixed state of ultrathin Bi films. In: Physica C: Superconductivity, 388-38 . pp. 779-780.
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Current-voltage (I-V) characteristics of quench condensed, superconducting, ultrathin Bi films in a magnetic field are reported. These I-Vs 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.
|Item Type:||Journal Article|
|Additional Information:||Copyright of this article belongs to Elsevier Science.|
|Keywords:||Bi thin films;mixed state.|
|Department/Centre:||Division of Physical & Mathematical Sciences > Physics|
|Date Deposited:||12 Nov 2009 11:38|
|Last Modified:||19 Sep 2010 04:57|
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