Magnetoresistance and SdH Oscillation of α-(BEDT-TTF)2RbHg(SCN)4 at low temperatures and high pressures

Abstract We report the first systematic measurement of magnetoresistance (MR) and Shubnikov-de Haas Oscillation (SdHO) in the organic conductor α-(BEDT-TTF) 2 RbHg(SCN) 4 , at low temperatures T = 150 mK to 3 K , high magnetic fields H =0 to 20 T , and pressures P =0 kbar to 12 kbar , where BEDT-TTF (abbreviated ET and hereafter) represents bis(ethylenedithiolo)tetrathiafalvalene. SdHO frequency F =637.6 T at 0 kbar and increases with pressure ( dF / dP = 11.74 T/kbar). Splitting in SdHO is observed at low pressures and the effect is enhanced by increasing pressure until it disappears at above 4 kbar. No superconductivity is found. The results are compared to an early study on a related material α-(BEDT-TTF) 2 KHg(SCN) 4 . The phenomena are discussed in the regime of available mechanisms.