par Gusman, Guy 
Référence Journal of physics and chemistry of solids, 28, 11, page (2327-2333)
Publication Publié, 1967-11
Référence Journal of physics and chemistry of solids, 28, 11, page (2327-2333)
Publication Publié, 1967-11
Article révisé par les pairs
| Résumé : | The isotope effect in transition metal superconductors is reexamined. The approximate calculations of Garland are shown to be qualitatively justifiable in the limit of sufficient dirtiness, i.e. ωD-1 ∼ τ ≫ ε{lunate}F-1. Here ωD is the Debye frequency, ε{lunate}F the Fermi energy of electrons and τ the relaxation time of electrons due to impurity scattering. Furthermore a necessary condition for Garland's calculation to be valid is that the effective mass ratio md* ms* be not greatly in excess of unity. If this condition is violated, which appears to be the case in such alloys as Nb3Sn, then a modification ensues wherein the cut-off of Garland corresponding to the band width is replaced by the d band plasma frequency. © 1967. |
