Oscillatory magnetoresistance in the field-induced SDW state in (TMTSF) 2 ClO 4

Abstract

The transverse magnetoresistance of (TMTSF) 2 ClO 4 was measured in pulsed high magnetic fields up to 35 T at T = 1.8−-4.2K for studying the field-induced spin density wave (FISDW) phase. In addition to a structure corresponding to the threshold field B th ( T) of the FISDW phase, we found two temperature dependent structures in higher field range at 15–17 and 22–25 T, respectively. Moreover, Shubnikov-de Haas type oscillations with smaller period were also observed superposing on the structures. It was found that the peak positions of the oscillation are independent of temperature, whereas their amplitude changes discontinuously at the structures.