High-T-c and unconventional superconductivity appears in a number of different materials with different physical properties. A common characteristics shared by almost all these compounds is that they are 'bad metal' in the sense that their effective charge carrier density is quite small, leading to a small Fermi energy E-F. In such a situation the dynamics of the electronic and lattice degrees of freedom becomes comparable (omega(ph) similar to E-F) driving these systems towards a breakdown of the Born-Oppenheimer adiabatic principle (omega(ph) << E-F) ruled by the comparison between the phonon frequency scale omega(ph) and E-F. The standard concept of Fermi liquid picture applied to the electron-phonon interaction needs thus to be deeply revised. We discuss the interesting implications of the onset of nonadiabatic effects on many properties of systems with small Fermi energy. (c) 2005 Elsevier Ltd. All rights reserved.

Nonadiabatic phenomenology in small Fermi energy superconductors / E., Cappelluti; Pietronero, Luciano. - In: JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS. - ISSN 0022-3697. - STAMPA. - 67(1-3):(2006), pp. 136-141. [10.1016/j.jpcs.2005.10.038]

Nonadiabatic phenomenology in small Fermi energy superconductors

PIETRONERO, Luciano
2006

Abstract

High-T-c and unconventional superconductivity appears in a number of different materials with different physical properties. A common characteristics shared by almost all these compounds is that they are 'bad metal' in the sense that their effective charge carrier density is quite small, leading to a small Fermi energy E-F. In such a situation the dynamics of the electronic and lattice degrees of freedom becomes comparable (omega(ph) similar to E-F) driving these systems towards a breakdown of the Born-Oppenheimer adiabatic principle (omega(ph) << E-F) ruled by the comparison between the phonon frequency scale omega(ph) and E-F. The standard concept of Fermi liquid picture applied to the electron-phonon interaction needs thus to be deeply revised. We discuss the interesting implications of the onset of nonadiabatic effects on many properties of systems with small Fermi energy. (c) 2005 Elsevier Ltd. All rights reserved.
2006
ELECTRON-PHONON INTERACTION; MIGDALS THEOREM; DOPED C-60
01 Pubblicazione su rivista::01a Articolo in rivista
Nonadiabatic phenomenology in small Fermi energy superconductors / E., Cappelluti; Pietronero, Luciano. - In: JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS. - ISSN 0022-3697. - STAMPA. - 67(1-3):(2006), pp. 136-141. [10.1016/j.jpcs.2005.10.038]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1753
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