Two rapid oscillations in the magnetoresistance in the field-induced spin-density-wave state of(TMTSF)2ClO4

Abstract

We report a systematic study of longitudinal and transverse magnetoresistance in the quasi-one-dimensional organic conductor $(\mathrm{TMTSF}{)}_{2}{\mathrm{ClO}}_{4}.$ We found two distinctly different quantum (rapid) oscillations (RO's) at different temperature regions in the field-induced spin-density-wave (FISDW) phase. For temperature sweeps in a fixed field, a resistance peak is observed at ${T}^{*}$ which depends on the field. Surprisingly, the type of RO is correlated with ${T}^{*}(H).$ The difference between two oscillations leads us to establish subphases in the main FISDW phase of $(\mathrm{TMTSF}{)}_{2}{\mathrm{ClO}}_{4}.$ We also found the low-field boundary of McKernan's 3.5 K phase from a sudden increase of resistance. Our results conclude that the separate SDW transition on each pair of the Fermi surfaces is possibly responsible for subphases in the FISDW phase.