New features of the phase transition to superconducting state in thin films

Details New features of the phase transition to superconducting state in thin films New features of the phase transition to superconducting state in thin films

2003-05-26

arxiv.org/abs/cond-mat/0305586v2

Physics

Condensed Matter

Superconductivity

11 pages, MikTexTeX, 3 fig, 2 Tables, corrected some typos, Submitted J.Phys:Cond Mat

Scientific paper

10.1088/0953-8984/15/34/308

The Halperin-Lubensky-Ma (HLM) effect of a fluctuation-induced change of the order of phase transition in thin films of type I superconductors with relatively small Ginzburg-Landau number $\kappa$ is considered. Numerical data for the free energy, the order parameter jump, the latent heat, and the specific heat of W, Al and In are presented to reveal the influence of film thickness and material parameters on the properties of the phase transition. We demonstrate for the first time that in contrast to the usual notion the HLM effect occurs in the most distinct way in superconducting films with high critical magnetic field $H_{c0}$ rather than in materials with small $\kappa$. The possibility for an experimental observation of the fluctuation change of the order of superconducting phase transition in superconducting films is discussed.

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