Disordering effects in superconductors with anisotropic pairing: From Cooper pairs to compact bosons |
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Authors: | M V Sadovskii A I Posazhennikova |
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Institution: | (1) Institute of Electrophysics, Ural Branch of the Russian Academy of Sciences, 620049 Ekaterinburg, Russia |
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Abstract: | In the weak-coupling BCS-theory approximation, normal impurities do not influence the superconducting transition temperature
T
c
in the case of isotropic s pairing. In the case of d pairing they result in a rapid destruction of the superconducting state. This is at variance with many experiments on the
disordering of high-T
c
superconductors, assuming that d pairing is realized in them. As the interelectronic attraction in a Cooper pair increases, the system transforms continuously
from a BCS-type superconductor with “loose” pairs to a picture of superconductivity of “compact,” strongly coupled bosons.
Near such a transition substantial deviations can be expected from the universal disorder dependence of T
c
, as determined by the Abrikosov-Gor’kov equation, and T
c
becomes more stable against disordering. Since high-T
c
super-conducting systems fall into the transitional region from BCS-type pairs to compact bosons, these results can explain
their relative stability against disordering.
Pis’ma Zh. éksp. Teor. Fiz. 65, No. 3, 258–262 (10 February 1997) |
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Keywords: | |
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