2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/16553At low temperatures electron hopping in a three dimensional Coulomb glass produces fluctuations in the single particle density of states and hence in the resistivity. This results in a low frequency resisitivity noise spectrum which goes as (1/f)^(alpha) where alpha is very close to 1. This holds down to extremely low frequencies.5 pages, Latex, 1 postscript figuresDisordered Systems and Neural NetworksStatistical Mechanicstext