Europhys. Lett.
Volume 47, Number 6, September 1999
Page(s) 681 - 687
Section Condensed matter: structure, mechanical and thermal properties
Published online 01 September 2002
DOI: 10.1209/epl/i1999-00443-7

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$\rm +i$ - Polarons and electron-phonon interactions.
PACS. 76.30$\rm -v$ - 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 $\chi$one of such quantities and show that the nonadiabatic corrections reduce $\chi$ with respect to its adiabatic limit. We also show that the nonadiabatic regime induces an isotope dependence of $\chi$, which in principle could be measured.


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