New radical cation salt κ-(BETS)2Co0.13Mn0.87[N(CN)2]3 with two magnetic metals: Synthesis, structure, conductivity and magnetic peculiarities

Abstract A new metallic radical cation salt κ‐(BETS) 2 Co 0.13 Mn 0.87 [N(CN) 2 ] 3 , where BETS is bis(ethylenedithio)tetraselenafulvalene, C 10 S 4 Se 4 H 8 , has been synthesized. In this salt, a part of Mn 2+ ions are replaced by Co 2+ which acts as a magnetic dopant with a different effective magnetic moment. Crystal structure, band structure, conducting and magnetic properties of the salt have been studied. Below 30 K the material undergoes a metal-insulator transition, which is suppressed by applying a pressure of ∼0.5 kbar, leading to a superconducting ground state. While the structural and conducting properties are very similar to those of the parent salt κ‐(BETS) 2 Mn[N(CN) 2 ] 3 , magnetic properties associated with localized moments in the anion layer are found to be surprisingly different.