Insulator/metal phase transition and colossal magnetoresistance in holographic model

Understand

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.