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The isotope effect in disordered strongly coupled superconductors
Author(s) -
Mierzyńska M.,
Wysokiński K. I.
Publication year - 2006
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200541292
Subject(s) - superconductivity , condensed matter physics , kinetic isotope effect , impurity , homogeneous , isotope , chemistry , high temperature superconductivity , singlet state , materials science , physics , thermodynamics , quantum mechanics , organic chemistry , deuterium , excited state
The isotope effect in disordered strongly coupled superconductors has been studied. Weakly disordered bulk s‐ and d‐wave superconductors as well as strongly disordered homogeneous and granular thin films have been considered. To treat strong coupling s‐wave superconductors Eliashberg theory has been used and the weak localization effects on isotope coefficient (IC) calculated within this approach. The interesting point is that weak localization effects known to properly describe degradation of transition temperature of s‐wave superconductors have been found to decrease the isotope coefficient of impure material with respect to pure samples. This is in contrast to the strong increase of IC induced by magnetic impurities in s‐wave or nonmagnetic impurities in d‐wave spin singlet superconductors. We have also calculated the change of isotope coefficient for both homogeneous and granular thin films and found that the effect of disorder in granular materials on the isotope coefficient is similar to that observed in high‐temperature superconductors. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)