Superconducting correlations in ultra-small metallic grains

Details Superconducting correlations in ultra-small metallic grains Superconducting correlations in ultra-small metallic grains

2000-03-08

arxiv.org/abs/cond-mat/0003119v1

Physics

Condensed Matter

Superconductivity

7 pages, 1 figure

Scientific paper

10.1209/epl/i2000-00279-7

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.

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