title: Imaging phase separation near the Mott boundary of the correlated organic superconductors kappa-(BEDT-TTF)2X.
abstract: 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.
authors.affiliation: Institute for Materials Research, Tohoku University, Katahira 2-1-1, Sendai 980-8577, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Sasaki
authors.forename: N
authors.initials: N
authors.lastname: Yoneyama
authors.forename: N
authors.initials: N
authors.lastname: Kobayashi
authors.forename: Y
authors.initials: Y
authors.lastname: Ikemoto
authors.forename: H
authors.initials: H
authors.lastname: Kimura