ePrints@IIScePrints@IISc Home | About | Browse | Latest Additions | Advanced Search | Contact | Help

Vortices and the mixed state of ultrathin Bi films

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.

[img] PDF
Vortices.pdf - Published Version
Restricted to Registered users only

Download (101Kb) | Request a copy
Official URL: http://www.sciencedirect.com/science?_ob=ArticleUR...

Abstract

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
URI: http://eprints.iisc.ernet.in/id/eprint/17513

Actions (login required)

View Item View Item