ISSN:
1434-6036
Schlagwort(e):
PACS. 74.25.-q General properties; correlations between physical properties in normal and superconducting states – 71.28.+d Narrow-band systems; intermediate-valence solids – 74.62.Dh Effects of crystal defects, doping and substitution
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Physik
Notizen:
Abstract: In small Fermi energy metals, disorder can deeply modify superconducting state properties leading to a strong suppression of the critical temperature Tc. 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 χ for a narrow band electron-phonon coupled metal as a function of the non-magnetic impurity scattering rate . We find that as soon as is comparable to E F, χ 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 σ-bands of the boron plane, sustaining therefore the hypothesis that MgB2 is a nonadiabatic metal.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1140/epjb/e2002-00408-2
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