Effective model of the electronic Griffiths phase
  We present simple analytical arguments explaining the universal emergence of electronic Griffiths phases as precursors of disorder-driven metal-insulator transitions in correlated electronic systems. A simple effective model is constructed and solved within Dynamical Mean Field Theory. It is shown to capture all the qualitative and even quantitative aspects of such Griffiths phases. 
D. Tanaskovic, E. Miranda, and V. Dobrosavljevic