Insulator/metal phase transition and colossal magnetoresistance in holographic model

Abstract

Within massive gravity, we construct a gravity dual for insulator/metal phase\ntransition and colossal magnetoresistance (CMR) effect found in some manganese\noxides materials. In heavy graviton limit, a remarkable\nmagnetic-field-sensitive DC resistivity peak appears at the Curie temperature,\nwhere an insulator/metal phase transition happens and the magnetoresistance is\nscaled with the square of field-induced magnetization. We find that metallic\nand insulating phases coexist below the Curie point and the relation with the\nelectronic phase separation is discussed.\n