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The phase diagram of θ-type BEDT-TTF salts is mapped out as a function of a dihedral angle (θ) or a transfer integral (t) between donor columns involving the series of θ-(BEDT-TTF) 2 MM′(SCN) 4 [M=Tl, Rb, Cs, M′=Co, Zn]recently prepared. The electronic phase diagram shows that the ground state changes from metallic, superconducting, antiferromagnetic, to non-magnetic insulating state...
The metal-insulator transitions occur at 190K and 20K for (BEDT-TTF) 2 MM'(SCN) 4 [M=Rb, M'=Co,Zn] and [M=Cs,M'=Co,Zn], respectively. The former transition at 190K might originate from electron-correlation with lattice modulation, suggested by the measurements of magnetic susceptibility and X-ray structure at low temperature. This transition temperature is elevated with applying pressure...
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