Strongly interacting $σ$-electrons and MgB$_2$ superconductivity

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dc.creatorIvanov, V. A.
dc.creatorBroek, M. van den
dc.creatorPeeters, F. M.
dc.date2001-09-19
dc.date.accessioned2026-07-07T09:31:07Z
dc.date.available2026-07-07T09:31:07Z
dc.descriptionMgB$(p^{n_σ}p^{n_π})_{2}$ is classified as a system with strongly interacting $σ$-electrons and non-correlated $π$-electrons of boron ions. The kinematic and Coulomb interaction V between the orbitally degenerated $σ$-electrons provide the superconducting state with an anisotropic gap of s*-wave symmetry. The critical temperature $T_c$ has a non-monotonic dependence on the distance r between the centers of gravity of $σ$- and $π$-bands. MgB$_2$ corresponds to r=0.085 eV and V=0.45 eV in our model with flat bands. The derived superconducting density of electronic states is in good agreement with available experimental and theoretical data. The possibilities for increasing $T_c$ are discussed.
dc.description8 pages, 4 figures
dc.identifierhttps://arxiv.org/abs/cond-mat/0109347
dc.identifierhttp://arxiv.org/abs/cond-mat/0109347
dc.identifierdoi:10.1016/S0038-1098(01)00351-9
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/158350
dc.subjectSuperconductivity
dc.titleStrongly interacting $σ$-electrons and MgB$_2$ superconductivity
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