Spin-glass transition in a Kondo lattice with quenched disorder

We use the Popov-Fedotov representation of spin operators to construct an e ffective action for a Kondo lattice model with quenched disorder at finite temperatures. We study the competition between the Kondo effect and frozen spin order in Ising-like spin glass. We present the derivation of new mean- field equations for the spin-glass order parameter and analyze the effects of screening of localized spins by conduction electrons on the spin-glass p hase transition. (C) 2000 MAIK "Nauka/Interperiodica".