TITLE

Superconducting Bands Stabilizing Superconductivity in YBa2Cu3O7 and MgB2

AUTHOR(S)
Krüger, Ekkehard
PUB. DATE
February 2010
SOURCE
Journal of Superconductivity & Novel Magnetism;Feb2010, Vol. 23 Issue 2, p213
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
It is shown that the ceramic superconductor YBa2Cu3O7 as well as the superconducting intermetallic compound MgB2 possesses a narrow, partly filled “superconducting band” with Wannier functions of special symmetry in their band structures. This result corroborates previous observations about the band structures of numerous superconductors and non-superconductors showing that evidently superconductivity is always connected with such superconducting bands. These findings are interpreted in the framework of a nonadiabatic extension of the Heisenberg model. Within this new group-theoretical model of correlated systems, Cooper pairs are stabilized by a nonadiabatic mechanism of constraining forces effective in narrow superconducting bands. The formation of Cooper pairs in a superconducting band is mediated by the energetically lowest boson excitations in the considered material that carry the crystal-spin angular momentum 1⋅ ℏ. These crystal-spin-1 bosons are proposed to determine whether the material is a conventional low- Tc or a high- Tc superconductor. This interpretation provides the electron–phonon mechanism that enters the BCS theory in conventional superconductors.
ACCESSION #
47202670

 

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