The first organic cation-radical salt superconductor (Tc= 4 K) with an organometallic anion: superconductivity, synthesis and structure of κL-(BEDT-TTF)2Cu(CF3)4·TCE

Abstract

Superconductivity at ambient pressure with onset T_c= 4.00 ± 0.05 K is reported in a unique organic cation-radical salt κ_L-(ET)₂Cu(CF₃)₄·TCE, [ET = bis(ethylenedithio)tetrathiafulvalene, TCE = 1,1,2-trichloroethane] with the Cu(CF₃)₄^– species being the first Cu³⁺ and F containing organometallic anion in an organic superconductor.