| Issue |
Europhys. Lett.
Volume 42, Number 6, June II 1998
|
|
|---|---|---|
| Page(s) | 667 - 672 | |
| Section | Condensed matter: electronic structure, electrical, magnetic and optical properties | |
| DOI | https://doi.org/10.1209/epl/i1998-00303-0 | |
| Published online | 01 September 2002 | |
Isotope effect on m* in high-
materials
due to the breakdown of Migdal's theorem
1
Dipartimento di Fisica, Università di Roma I
“La Sapienza”, Piazzale A. Moro, 2, 00185 Roma, Italy
Istituto Nazionale Fisica della Materia, Sezione di Roma 1 - Roma, Italy
2
Max-Planck-Institut für Festkörperforschung,
Heisenbergstrasse 1, D-70569 Stuttgart, Germany
3
ICTP, P.O. Box 586 - 34100 Trieste, Italy
Received:
26
January
1998
Accepted:
23
April
1998
We show that the inclusion of effects beyond Migdal's limit
in the electron-phonon interaction naturally leads to an
isotope effect for the effective mass m* of the charge carriers
even much before reaching the polaron limit.
This is the situation already considered in our approach to
nonadiabatic superconductivity (Phys. Rev. Lett., 75 (1995) 1158).
Such a result provides a scenario different from the polaronic one
for the interpretation of the recently observed isotope effect on m* in
and 
(Zhao et al., Phys. Rev. B,
51 (1995) 16487 and Nature, 385 (1997) 236).
PACS: 71.38.+i – Polarons and electron-phonon interactions / 74.25.Kc – Phonons / 71.18.+y – Fermi surface: calculations and measurements; effective mass, g factor
© EDP Sciences, 1998
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