Possible Depinning Transition of a Single Flux Line Near a Columnar Defect in Type II Superconductors

2001/06/17 by A. M. Ettouhami, Ettouhami, A. M.
Engineering · Physics and Astronomy · #FOS: Physical sciences #Physics of Superconductivity and Magnetism #Statistical Mechanics (cond-mat.stat-mech) #Superconducting Materials and Applications #Superconductivity (cond-mat.supr-con)

paper · pdf · doi:10.48550/arxiv.cond-mat/0106322

openalex publication_date 2001/06/17 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

We use the Feynman--Kleinert variational method [R.P. Feynman and H. Kleinert, Phys. Rev. A \bf 34, 5080, (1986)] to calculate the partition function and effective pinning energy of a single flux line near a columnar pin in type II superconductors. It is found that there is a phase transition between a low temperature phase where the flux line is localized near the columnar pin and where its internal modes fluctuations are bounded, and a high temperature, depinned phase where the flux line is delocalized and its internal fluctuations are those of a free line.

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