Volume 50, Number 3, May I 2000
|Page(s)||361 - 367|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||01 September 2002|
Superconducting correlations in ultra-small metallic grains
Department of Physics, Hong Kong Baptist University
Kowloon Tong, Hong Kong, PRC
2 Department of Physics, Peking University - Beijing 100871, PRC
3 Department of Physics, Zhejiang University - Hangzhou 310027, PRC
Accepted: 2 March 2000
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.
PACS: 74.20.Fg – BCS theory and its development / 71.10.-w – Theories and models of many electron systems / 71.24.+q – Electronic structure of clusters and nanoparticles
© EDP Sciences, 2000
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