Insulator/metal phase transition and colossal magnetoresistance in holographic model

Abstract

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

Use massive gravity and consider reaction on the geometry

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• Holographic paramagnetic-ferromagnetic phase transition with Power-Maxwell electrodynamics
• Understanding strongly coupling magnetism from holographic duality
• Holographic paramagnetic-ferromagnetic phase transition of Power-Maxwell-Gauss-Bonnet black holes
• Lifshitz scaling effects on the holographic paramagnetic-ferromagnetic phase transition
• Holographic conductivity of 1+1 dimensional systems in soft wall model