Imaging phase separation near the Mott boundary of the correlated organic superconductors kappa-(BEDT-TTF)2X.
Electronic phase separation consisting of the metallic and insulating domains with 50-100 microm in diameter is found in the organic Mott system kappa-[(h8-BEDT-TTF)(1-x)(d8-BEDT-TTF)x]2Cu[N(CN)2]Br by means of scanning microregion infrared spectroscopy using the synchrotron radiation. The phase separation appears below the critical end temperature 35-40 K of the first-order Mott transition. The observation of the macroscopic size of the domains indicates a different class of the intrinsic electronic inhomogeneity from the nanoscale one reported in the inorganic Mott systems such as high-Tc copper and manganese oxides.
Sasaki
T
T
Institute for Materials Research, Tohoku University, Katahira 2-1-1, Sendai 980-8577, Japan.
Yoneyama
N
N
Kobayashi
N
N
Ikemoto
Y
Y
Kimura
H
H