Abstract
We calculate that the mean-square amplitude of the fluctuations of the condensate chemical potential ..mu../sub s/ due to charge-imbalance fluctuations in the limit ..delta../k/sub B/T = 2(k/sub B/T)/sup 2//..pi..delta..cap omega..N(0) in a volume ..cap omega.. of superconductor. We relate these fluctuations via Nyquist's theorem to measured values of the contribution of self-injected charge imbalance to the dc resistance of SIN tunnel junctions. In this relation the dynamic charge-imbalance relaxation rate is 1/tau/sub E/, the electron-phonon scattering rate.
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