Magnetotransport measurements on β″-(BEDT-TTF)4[H3O) Ga3+ (C2O4)3]. C6H5NO2

Transport measurements have been carried out on single crystals of the charge transfer salt β-(BEDT-TTF) 4 [(H 3 O)Ga 3+ (C 2 O 4 ) 3 ]. C 6 H 5 NO 2 , using magnetic fields of up to 33 T and temperatures down to 0.55 K. The material is found to be superconducting with T c 7.5 K and an in-plane critical field B c2 ≥ 33 T, and to exhibit Shubnikov-de Haas (SdH) oscillations. The temperature and angle dependence of the Shubnikov-de Haas oscillations and the upper critical field are reported, allowing information about the anisotropy of the upper critical field, effective mass m*, and the Fermi-surface (FS) of the material to be deduced.