Volume 108, Number 4, November 2014
|Number of page(s)||4|
|Section||Atomic, Molecular and Optical Physics|
|Published online||25 November 2014|
Pair correlation and dynamic Jahn-Teller effect: High-Tc in nanoclusters
1 Lawrence Berkeley Laboratory, University of California at Berkeley - Berkeley, CA 94720 USA
2 L. Landau Institute for Theoretical Physics, RAN - Moscow, 117334 Russia
3 Laboratoire de Physique des Solids, Université Paris XI, Bâtiment 510 - 91405 Orsay Cedex, France, EU
Received: 8 September 2014
Accepted: 3 November 2014
Electronic states in metallic nanoclusters form energy shells and degree of their filling depends on the number of delocalized electrons. In the region close to half-filling the cluster's geometry oscillates between the prolate and oblate configurations (dynamic Jahn-Teller effect). For large clusters (N > 102; N is the number of delocalized electrons) this effect competes with pair correlation and, as a result, it is perfectly realistic to observe the transition to the superconducting state. For some clusters (e.g., for Zn76, Al70) the value of the critical temperature is rather high .
PACS: 36.40.-c – Atomic and molecular clusters / 74.70.-b – Superconducting materials other than cuprates
© EPLA, 2014
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