Imaging phase separation near the Mott boundary in the correlated organic superconductors κ-(BEDT-TTF)₂X

2004/02/05 by T. Sasaki, N. Yoneyama, N. Kobayashi +2
Physics and Astronomy · #cond-mat.str-el #cond-mat.supr-con

paper · pdf · doi:10.1103/physrevlett.92.227001

published as Phys. Rev. Lett. 92, 227001 (2004) · 4 pages, 3 figures

arxiv created 2004/02/05 · arxiv updated 2009/12/01

Abstract

Electronic phase separation consisting of the metallic and insulating domains with 50 -- 100 μm in diameter is found in the organic Mott system κ-[(h8-BEDT-TTF)_1-x(d8-BEDT-TTF)_x]₂Cu[N(CN)₂]Br by means of scanning micro-region 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 nano-scale one reported in the inorganic Mott systems such as High-T_c copper and manganese oxides.

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