Europhys. Lett, 47 (6), pp. 681-687 (1999)
Pauli susceptibility of nonadiabatic Fermi liquids
C. Grimaldi 1 and L. Pietronero 2
1 Ecole Politechnique Fédérale de Lausanne
DMT-IPM CH-1015 Lausanne, Switzerland
2 Dipartimento di Fisica and Unità INFM, Università di Roma "La Sapienza''
P.le A. Moro 2, I-00185 Roma, Italy
(received 30 March 1999; accepted 5 July 1999)
PACS. 63.20Kr - Phonon-electron and phonon-phonon interactions.
PACS. 71.38 - Polarons and electron-phonon interactions.
PACS. 76.30 - Electron paramagnetic resonance and relaxation.
The nonadiabatic regime of the electron-phonon interaction leads to behaviors of some physical measurable quantities qualitatively different from those expected from the Migdal-Eliashberg theory. Here we identify in the Pauli paramagnetic susceptibility one of such quantities and show that the nonadiabatic corrections reduce with respect to its adiabatic limit. We also show that the nonadiabatic regime induces an isotope dependence of , which in principle could be measured.
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