Paramagnetic Breakdown of Superconductivity in Ultrasmall Metallic Grains

Details Paramagnetic Breakdown of Superconductivity in Ultrasmall Metallic Grains Paramagnetic Breakdown of Superconductivity in Ultrasmall Metallic Grains

1997-04-22

arxiv.org/abs/cond-mat/9704181v2

Phys. Rev. Lett. 79, 921 (1997)

Physics

Condensed Matter

Superconductivity

4 pages of revtex, 3 postscript figures, uses psfrag.sty, epsfig.sty. Slightly revised and improved version, matching publishe

Scientific paper

10.1103/PhysRevLett.79.921

We study the magnetic-field-induced breakdown of superconductivity in nm-scale metal grains having a mean electron level spacing $d \simeq \tilde\Delta$ (bulk gap). Using a generalized variational BCS approach that yields good qualitative agreement with measured spectra, we argue that Pauli paramagnetism dominates orbital diamagnetism, as in the case of thin films in a parallel magnetic field. However, the first-order transition observed for the latter can be made continuous by finite size effects. The mean-field procedure of describing the system by a single pairing parameter $\Delta$ breaks down for $d \simeq \tilde\Delta$.

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