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Phys Rev Lett. 2004 Jun 4;92(22):227001. Epub 2004 Jun 2.

Imaging phase separation near the Mott boundary of the correlated organic superconductors kappa-(BEDT-TTF)2X.

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1
Institute for Materials Research, Tohoku University, Katahira 2-1-1, Sendai 980-8577, Japan.

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.

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