Feedback Effects in Superconductors

Details Feedback Effects in Superconductors Feedback Effects in Superconductors

1993-07-07

arxiv.org/abs/cond-mat/9307010v1

Phys.Rev. B49 (1994) 740-743

Physics

Condensed Matter

9 pages, requires harvmac.tex, 3 uuencoded tar-compressed figures submitted separately, EFI-93-37. Complete postscript file al

Scientific paper

10.1103/PhysRevB.49.740

We calculate corrections to the BCS gap equation caused by the interaction of electrons with the collective phase and amplitude modes in the superconducting state. This feedback reduces the BCS gap parameter, $\Delta$, and leaves the critical temperature, $T_c$, unchanged. The feedback effect is proportional to $(\Delta / {\scriptstyle{\cal E}_F})^2$, where ${\scriptstyle{\cal E}_F}$ is the Fermi energy. This is a negligible correction for type-I superconductors. However in type-II superconductors the feedback effect is greatly enhanced due to smaller Fermi velocities, $v_F$, and may be responsible for effects seen in recent experimental data on organic superconductors.

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