Variations of Casimir energy from a superconducting transition

Details Variations of Casimir energy from a superconducting transition Variations of Casimir energy from a superconducting transition

2005-05-23

arxiv.org/abs/hep-th/0505200v2

Nucl.Phys. B726 (2005) 441-463

Physics

High Energy Physics

High Energy Physics - Theory

RevTex 4, 15 pages, 8 figures. Revised version with improved presentation, a brief description of the ALADIN experiment, and a

Scientific paper

10.1016/j.nuclphysb.2005.08.010

We consider a five-layer Casimir cavity, including a thin superconducting film. We show that when the cavity is cooled below the critical temperature for the onset of superconductivity, the sharp variation (in the microwave region) of the reflection coefficient of the film produces a variation in the value of the Casimir energy. Even though the relative variation in the Casimir energy is very small, its magnitude can be comparable to the condensation energy of the superconducting film, and thus causes a significant increase in the value of the critical magnetic field, required to destroy the superconductivity of the film. The proposed scheme might also help clarifying the current controversy about the magnitude of the contribution to Casimir free energy from the TE zero mode, as we find that alternative treatments of this mode strongly affect the shift of critical field.

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