Dynamic Jahn-Teller Mechanism of Superconductivity in MgB$_2$

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We propose a novel mechanism of superconductivity in MgB$_2$ based on the dynamic electronic structure of the $pσ$-orbitals coupled with $e_{2g}$ phonons. A nonconventional superconducting state is found to arise frome lectron-phonon interactions in the presence of additional pairing channels made available by the dynamic Jahn-Teller effects. A partially broken pseudo-spin symmetry in this Jahn-Teller system, together with two-phonon exchange pairing, naturally gives rise to two distinct gaps both of which are basically isotropic in the ($k_x$, $k_y$) space. Important experimental observations including high $T_c$ and the anomalous specific heat are explained using this theory.

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Superconductivity

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http://salesiana.dossiersoluciones.com/handle/123456789/19016

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/cond-mat/0203204
 http://arxiv.org/abs/cond-mat/0203204

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arXiv