Abstract
Field-induced successive transitions were observed in magnetoresistance in the quasi-one-dimensional organic conductor, HMTSF-TCNQ, hexamethylene-tetraselena-fulvalene-tetracyanoquinodimethane. The magnetoresistance exhibits kink transitions accompanying hysteresis at pressures around 1GPa, but neither at p=0 nor at 2GPa. At p=0 and below 30K, this material undergoes charge density wave (CDW) state, which is suppressed around 1GPa, where successive transitions are observed. Since these behavior is only observed at the boundary in pressure between insulator and metal, and the nature of the insulating state is CDW at p=0, it is strongly suggested that the successive transitions observed in magnetoresistance might be associated with CDW, accordingly a field-induced CDW by the one-dimensionalization by strong magnetic field ranging from 10 to 30T. The behaviors are compared with previously claimed FICDW and the established FISDW (field-induced-spin-density-wave).
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