MAGNETORESISTANCE AND SDH OSCILLATION OF ALPHA-(BEDT-TTF)2RBHG(SCN)4 AT LOW-TEMPERATURES AND HIGH-PRESSURES

We report the first systematic measurement of magnetoresistance (MR) a nd Shubnikov-de Haas Oscillation (SdHO) in the organic conductor alpha -(BEDT-TTF)2RbHg(SCN)4, at low temperatures T=150 mK to 3 K, high magn etic fields H=0 to 20 T, and pressures P-0 kbar to 12 kbar, where BEDT -TTF (abbreviated ET and hereafter) represents bis(ethylenedithiolo)te trathiafalvalene. SdHO frequency F=637.6 T at 0 kbar and increases wit h 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 d isappears at above 4 kbar. No superconductivity is found. The results are compared to an early study on a related material alpha-(BEDT-TTF)2 KHg(SCN)4. The phenomena are discussed in the regime of available mech anisms.