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Superconductivity in the nonadiabatic limit

Sarkar, Sujit (1998) Superconductivity in the nonadiabatic limit. In: Physica C: Superconductivity, 299 (1-2). pp. 136-146.

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Isotope-shift exponent (cu) and the pressure coefficient of superconducting transition temperature (beta) have been studied in the nonadiabatic limit. We have considered the effect of nonadiabaticity in both within and beyond the Migdal-Eliashberg formalism. It reveals from our study that the pressure coefficient of superconducting transition is high for the low-T-c region and low for the high-T-c region and the minimum value of alpha is obtained where the transition temperature is maximum. Lowest value of isotope-shift exponent is obtained for small momentum exchange between the electrons and the bosonic field. Qualitative variation of beta with temperature is consistent with the experimental results of the hole doped superconductors for small momentum exchange.

Item Type: Journal Article
Publication: Physica C: Superconductivity
Publisher: Elsevier Science
Additional Information: Copyright of this article belongs to Elsevier Science.
Keywords: Nonadiabatic superconductivity;Migdal–Eliashberg formalism; Isotope-shift exponent;Pressure coefficient of superconducting transition temperature.
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 16 Dec 2009 12:18
Last Modified: 19 Sep 2010 05:27
URI: http://eprints.iisc.ac.in/id/eprint/19329

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