Feedback effects in superconductors

Tony Gherghetta; Yoichiro Nambu

doi:10.1103/PhysRevB.49.740

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Feedback effects in superconductors

Tony Gherghetta, Yoichiro Nambu

DOI 10.1103/PhysRevB.49.740 · Physical Review B

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Abstract

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 Δ and leaves the critical temperature Tc unchanged. The feedback effect is proportional to (Δ/ɛF)2, where ɛF 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 vF, and may be responsible for effects seen in recent experimental data on organic superconductors.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
NbSe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown