2002/03/09 by Young-Woo Son, Young‐Woo Son, Son, Young-Woo +4
Materials Science · Physics and Astronomy · #FOS: Physical sciences #Iron-based superconductors research #Physics of Superconductivity and Magnetism #Superconductivity (cond-mat.supr-con) #Superconductivity in MgB2 and Alloys #cond-mat.supr-con
paper · pdf · doi:10.48550/arxiv.cond-mat/0203204
arxiv created 2002/03/09 · openalex publication_date 2002/03/09 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We propose a novel mechanism of superconductivity in MgB2 based on the dynamic electronic structure of the pσ-orbitals coupled with e2g 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 (kx, ky) space. Important experimental observations including high Tc and the anomalous specific heat are explained using this theory.