Vortex dynamics and upper critical fields in ultrathin Bi films
Data(s) |
2001
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Resumo |
Current-voltage (I-V) characteristics of quench condensed, superconducting, ultrathin Bi films in a magnetic field are reported. These I-V's 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. |
Formato |
application/pdf |
Identificador |
http://eprints.iisc.ernet.in/40385/1/Vortex_dynamics_and.pdf Sambandamurthy, G and Chandrasekhar, N and Gupta, Das K (2001) Vortex dynamics and upper critical fields in ultrathin Bi films. In: Physical Review B, 63 (21). p. 214519. |
Publicador |
The American Physical Society |
Relação |
http://prb.aps.org/abstract/PRB/v63/i21/e214519 http://eprints.iisc.ernet.in/40385/ |
Palavras-Chave | #Physics |
Tipo |
Journal Article PeerReviewed |