Volume 67, Number 3, August 2004
|Page(s)||446 - 452|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||01 July 2004|
Transition to a superconductor with insulating cavities
Instituto de Física, Universidade Federal do Rio de Janeiro C.P. 68528, 21941-972, Rio de Janeiro RJ, Brasil
Accepted: 17 May 2004
An extreme type-II superconductor with internal insulating regions, namely cavities, is studied here. We find that the cavity-bearing superconductor has lower energy than the defect-free superconductor above a critical magnetic induction B* for insulating cavities but not for metallic ones. Using a numerical approach for the Ginzburg-Landau theory, we compute and compare free energy densities for several cavity radii and at least for two cavity densities, assuming a cubic lattice of spherical cavities.
PACS: 74.20.De – Phenomenological theories (two-fluid, Ginzburg-Landau, etc.) / 74.25.-q – Properties of type-I and type-II superconductors / 74.81.-g – Inhomogeneous superconductors and superconducting systems
© EDP Sciences, 2004
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