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Electron-Phonon or Hole Superconductivity in $MgB_2$? | | J. E. Hirsch
; F. Marsiglio
; | | Date: |
27 Feb 2001 | | Journal: | Phys. Rev. B 64, 144523 (2001) | | Subject: | Superconductivity; Strongly Correlated Electrons | cond-mat.supr-con cond-mat.str-el | | Abstract: | The BCS electron-phonon mechanism and the unconventional ’hole mechanism’ have been proposed as explanations for the high temperature superconductivity observed in $MgB_2$. It is proposed that a critical test of which theory is correct is the dependence of $T_c$ on hole doping: the hole mechanism predicts that $T_c$ will drop rapidly to zero as holes are added, while the electron-phonon mechanism appears to predict increasing $T_c$ for a substantial range of hole doping. Furthermore, the hole mechanism and electron-phonon mechanism differ qualitatively in their predictions of the effect on $T_c$ of change in the $B-B$ 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. | | Source: | arXiv, cond-mat/0102479 | | Services: | Forum | Review | PDF | Favorites | |
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