Pair correlation and dynamic Jahn-Teller effect: high Tc in nanoclusters

TL;DR

This paper explores how the interplay of electronic shell structure, dynamic Jahn-Teller effects, and pair correlations in metallic nanoclusters can lead to high-temperature superconductivity, with critical temperatures reaching around 140K.

Contribution

It introduces a model linking Jahn-Teller effects and pair correlations in nanoclusters, explaining high Tc superconductivity in these systems.

Findings

High Tc near 140K observed in certain nanoclusters.

Dynamic Jahn-Teller effect influences superconducting transition.

Competition between Jahn-Teller distortions and pairing affects superconductivity.

Abstract

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 geometry oscillates between the prolate and oblate configurations (dynamic Jahn-Teller effect). For large clusters 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 the value of the critical temperature is rather high, near 140K