Electronic structure of novel cation-radical salts in high magnetic fields

Two organic conducting materials, where unusual aspects of their composition play important roles, are explored: β″-(BEDT-TTF) 2 SF 5 XSO 3 which exhibits superconductivity, or a metal-insulator transition (for X =CH 2 CF 2 or CHF respectively), and τ-(P-S,S-DMEDT-TTF) 2 (AuBr 2 )(AuBr 2 ) y which exhibits a large, hysteretic, negative magnetoresistance. Detailed angular dependent magnetoresistance studies that allow a tomographic view of the electronic structure of these materials with increasing magnetic fields are presented.