Pressure-induced Mott transition in an organic superconductor with a finite doping level.
We report the pressure study of a doped organic superconductor with a Hall coefficient and conductivity measurements. We find that maximally enhanced superconductivity and a marginal-Fermi liquid appear around a certain pressure where mobile carriers increase critically, suggesting a possible quantum phase transition between strongly and weakly correlated regimes. This observation points to the presence of a criticality in Mottness for a doped Mott insulator with tunable correlation.
Department of Applied Physics, University of Tokyo, Bunkyo-ku, Tokyo 113-0032, Japan.
H
H
Oike
Department of Applied Physics, University of Tokyo, Bunkyo-ku, Tokyo 113-0032, Japan.
K
K
Miyagawa
Department of Physics, Saitama University, Saitama, Saitama 338-8570, Japan.
H
H
Taniguchi
Department of Applied Physics, University of Tokyo, Bunkyo-ku, Tokyo 113-0032, Japan.
K
K
Kanoda