Spectral density of current fluctuations at zero frequency is calculated for a long diffusive SNS junction with low-resistive interfaces. At low temperature, T << Delta, the subgap shot noise approaches linear voltage dependence, S=(2/ 3R)(eV + 2Delta), which is the sum of the shot noise of the normal conductor and voltage independent excess noise. This result can also be interpreted as the 1/3-suppressed Poisson noise for the effective charge q = e(1+2Delta/eV) transferred by incoherent multiple Andreev reflections (MAR). At higher temperatures, anomalies of the current noise develop at the gap subharmonics, eV = 2Delta/n. The crossover to the hot electron regime from the MAR regime is analyzed in the limit of small applied voltages.
@article{arxiv.cond-mat/0010203,
title = {Current noise in long diffusive SNS junctions in the incoherent MAR regime},
author = {E. V. Bezuglyi and E. N. Bratus' and V. S. Shumeiko and G. Wendin},
journal= {arXiv preprint arXiv:cond-mat/0010203},
year = {2014}
}