Journal
EUROPHYSICS LETTERS
Volume 50, Issue 3, Pages 361-367Publisher
E D P SCIENCES
DOI: 10.1209/epl/i2000-00279-7
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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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