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

Details Imaging phase separation near the Mott boundary in the correlated organic superconductors $κ$-(BEDT-TTF)$_{2}$X Imaging phase separation near the Mott boundary in the correlated organic superconductors $κ$-(BEDT-TTF)$_{2}$X

2004-02-05

arxiv.org/abs/cond-mat/0402147v1

Phys. Rev. Lett. 92, 227001 (2004)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.92.227001

Electronic phase separation consisting of the metallic and insulating domains with 50 -- 100 $\mu$m in diameter is found in the organic Mott system $\kappa$-[($h$8-BEDT-TTF)$_{1-x}$($d$8-BEDT-TTF)$_{x}$]$_{2}$Cu[N(CN)$_{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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