Localization-induced Griffiths phase of disordered Anderson lattices

Details Localization-induced Griffiths phase of disordered Anderson lattices Localization-induced Griffiths phase of disordered Anderson lattices

2000-03-13

arxiv.org/abs/cond-mat/0003209v2

Phys. Rev. Lett. 86, 264 (2001)

Physics

Condensed Matter

Strongly Correlated Electrons

Final published version (4 pages, 4 figures)

Scientific paper

10.1103/PhysRevLett.86.264

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 = W_c) and is characterized by power-law anomalies, e. g. C/T ~ 1/T^{(1-\alpha)}, where the exponent \alpha varies 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 W_{MIT} ~ 12 W_c, resulting in an extraordinarily robust NFL metallic phase.

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