In small Fermi energy metals, disorder can deeply modify superconducting state properties leading to a strong suppression of the critical temperature T-c. In this paper, we show that also normal state properties can be seriously influenced by disorder when the Fermi energy E-F is sufficiently small. We calculate the normal state spin susceptibility chi for a narrow band electron-phonon coupled metal as a function of the non-magnetic impurity scattering rate gamma(imp). We find that as soon as gamma(imp) is comparable to E-F, chi is strongly reduced with respect to its value in the clean limit. The effects of the electron-phonon interaction including the nonadiabatic corrections are discussed. Our results strongly suggest that the recent finding on irradiated MgB2 samples can be naturally explained in terms of small E-F values associated with the a-bands of the boron plane, sustaining therefore the hypothesis that MgB2 is a nonadiabatic metal.

Spin susceptibility in small Fermi energy systems: effects of nonmagnetic impurities / E., Cappelluti; C., Grimaldi; Pietronero, Luciano. - In: THE EUROPEAN PHYSICAL JOURNAL. B, CONDENSED MATTER PHYSICS. - ISSN 1434-6028. - STAMPA. - 30 (4):(2002), pp. 511-517. [10.1140/epjb/e2002-00408-2]

Spin susceptibility in small Fermi energy systems: effects of nonmagnetic impurities

PIETRONERO, Luciano
Writing – Original Draft Preparation
2002

Abstract

In small Fermi energy metals, disorder can deeply modify superconducting state properties leading to a strong suppression of the critical temperature T-c. In this paper, we show that also normal state properties can be seriously influenced by disorder when the Fermi energy E-F is sufficiently small. We calculate the normal state spin susceptibility chi for a narrow band electron-phonon coupled metal as a function of the non-magnetic impurity scattering rate gamma(imp). We find that as soon as gamma(imp) is comparable to E-F, chi is strongly reduced with respect to its value in the clean limit. The effects of the electron-phonon interaction including the nonadiabatic corrections are discussed. Our results strongly suggest that the recent finding on irradiated MgB2 samples can be naturally explained in terms of small E-F values associated with the a-bands of the boron plane, sustaining therefore the hypothesis that MgB2 is a nonadiabatic metal.
2002
SUPERCONDUCTIVITY; MGB2
01 Pubblicazione su rivista::01a Articolo in rivista
Spin susceptibility in small Fermi energy systems: effects of nonmagnetic impurities / E., Cappelluti; C., Grimaldi; Pietronero, Luciano. - In: THE EUROPEAN PHYSICAL JOURNAL. B, CONDENSED MATTER PHYSICS. - ISSN 1434-6028. - STAMPA. - 30 (4):(2002), pp. 511-517. [10.1140/epjb/e2002-00408-2]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1936
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