We study the field effect on the strain-induced Mott-insulating state of an organic superconductor κ-(BEDT-TTF)2Cu[N(CN)2]Br. The gate voltage dependences of the conductivity, Hall coefficient, and thermopower were investigated. While the conductivity obeyed an activation-type insulating formula, the Hall coefficient and thermopower exhibited continuous transition to a metal-like band structure under high gate voltage. This indicates the merger of Hubbard bands at finite electrostatic doping; that is, the field-induced Mott transition.
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|Publication status||Published - 2011 Sep 16|
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics