Electron-Phonon or Hole Superconductivity in $MgB_2$?
Abstract
The BCS electron-phonon mechanism and the unconventional 'hole mechanism' have been proposed as explanations for the high temperature superconductivity observed in . It is proposed that a critical test of which theory is correct is the dependence of on hole doping: the hole mechanism predicts that will drop rapidly to zero as holes are added, while the electron-phonon mechanism appears to predict increasing for a substantial range of hole doping. Furthermore, the hole mechanism and electron-phonon mechanism differ qualitatively in their predictions of the effect on of change in the distances. We discuss predictions of the hole mechanism for a variety of observables as a function of doping, emphasizing the expected differences and similarities with the electron-phonon explanation. The hole mechanism predicts coherence length and penetration depth to increase and decrease monotonically with hole doping respectively.
Cite
@article{arxiv.cond-mat/0102479,
title = {Electron-Phonon or Hole Superconductivity in $MgB_2$?},
author = {J. E. Hirsch and F. Marsiglio},
journal= {arXiv preprint arXiv:cond-mat/0102479},
year = {2009}
}
Comments
Minor changes in wording in view of referee's comments; one curve added to fig. 11; under consideration for publication in Phys.Rev. B