Superconducting correlations in ultra-small metallic grains

Abstract

To describe the crossover from the bulk BCS superconductivity to a fluctuation-dominated regime in ultrasmall metallic grains, new order parameters and correlation functions, such as ``parity gap'' and ``pair-mixing correlation function'', have been recently introduced. In this paper, we discuss the small-grain behaviour of the Penrose-Onsager-Yang off-diagonal long-range order (ODLRO) parameter in a pseudo-spin representation. Relations between the ODLRO parameter and those mentioned above are established through analytical and numerical calculations.

7 pages, 1 figure

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Cited by in corpus (6)

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• Exact mesoscopic correlation functions of the pairing model
• Bethe Ansatz approach to the pairing fluctuations in the mesoscopic regime
• Order parameter, correlation functions and fidelity susceptibility for the BCS model in the thermodynamic limit