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We investigate the finite-temperature properties of an Anderson lattice withregularly depleted impurities. The physics of this model is ruled by twodifferent magnetic exchange mechanisms: conventionalRuderman-Kittel-Kasuya-Yosida (RKKY) interaction at weak hybridization strengthV and a novel inverse indirect magnetic exchange (IIME) at strong V, bothfavoring a ferromagnetic ground state. The stability of ferromagnetic orderagainst thermal fluctuations is systematically studied by static mean-fieldtheory for an effective low-energy spin-only model emerging perturbatively inthe strong-coupling limit as well as by dynamical mean-field theory for thefull model. The Curie temperature is found at a maximum for a half-filledconduction band and at intermediate hybridization strengths in the crossoverregime between RKKY and IIME.

Crossover from conventional to inverse indirect magnetic exchange in the depleted Anderson lattice