Imaging phase separation near the Mott boundary in the correlated organic superconductors $\kappa$-(BEDT-TTF)${}_2$X

Abstract

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.

4 pages, 3 figures

References in corpus (8)

• Imaging the granular structure of high-Tc superconductivity in underdoped Bi2Sr2CaCu2O8+x
• Similarities between organic and cuprate superconductors
• Mott transition and transport crossovers in the organic compound $\kappa -(BEDT-TTF{)}_{2}Cu[N(CN{)}_2]Cl$
• Evidence for structural and electronic instabilities at intermediate temperatures in $\kappa$-(BEDT-TTF)${}_2$X for X=Cu[N(CN)${}_2$]Cl, Cu[N(CN)${}_2$]Br and Cu(NCS)${}_2$: Implications for the phase diagram of these quasi-2D organic superconductors
• Magnetic and Electronic Phase Diagram and Superconductivity in the Organic Superconductors k-(BEDT-TTF)2X
• Electronic correlation in the infrared optical properties of the quasi two dimensional $\kappa$-type BEDT-TTF dimer system
• Impurity Effect on the In-plane Penetration Depth of the Organic Superconductors $\kappa$-(BEDT-TTF)${}_{2}X$ ($X$ = Cu(NCS)${}_2$ and Cu[N(CN)${}_2$]Br)
• Disorder Effect on the Vortex Pinning by the Cooling Process Control in the Organic Superconductor $\kappa$-(BEDT-TTF)${}_2$Cu[N(CN)${}_2$]Br

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