Localization-induced Griffiths phase of disordered Anderson lattices

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We demonstrate that local density of states fluctuations in disordered Anderson lattice models universally lead to the emergence of non-Fermi liquid (NFL) behavior. The NFL regime appears at moderate disorder (W = Wc) and is characterized by power-law anomalies, e. g. C/T 1/T⁽¹⁻α⁾, where the exponent αvaries continuously with disorder, as in other Griffiths phases. This Griffiths phase is not associated with the proximity to any magnetic ordering, but reflects the approach to a disorder-driven metal-insulator transition (MIT). Remarkably, the MIT takes place only at much larger disorder WMIT 12 Wc, resulting in an extraordinarily robust NFL metallic phase.