Volume 47, Number 6, September II 1999
|Page(s)||681 - 687|
|Section||Condensed matter: structure, mechanical and thermal properties|
|Published online||01 September 2002|
Pauli susceptibility of nonadiabatic Fermi liquids
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
Accepted: 5 July 1999
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 χ one of such quantities and show that the nonadiabatic corrections reduce χ with respect to its adiabatic limit. We also show that the nonadiabatic regime induces an isotope dependence of χ, which in principle could be measured.
PACS: 63.20.Kr – Phonon-electron and phonon-phonon interactions / 71.38.+i – Polarons and electron-phonon interactions / 76.30.-v – Electron paramagnetic resonance and relaxation
© EDP Sciences, 1999
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