Abstract
The dependence of field-induced spin-density-wave (FISDW) transitions on the magnetic field orientation has been studied by magnetoresistance experiments in (TMTSF) 2 ClO 4 and mean-field theory. Experimentally, when the magntic field is rotated in the b'c * -plane normal to the 1D axis, the threshold field B th (θ) is almost scaled by 1/cosθ (θ:angle from the c * -axis), but it shows small but sharp decrease at Lebed's magic angles plq=1 and -1. This means stabilization of FISDW at magic angles. On the other hands, the mean-field theory based on linearized band model with multiple transfers concludes suppresion of FISDW at magic angles due to increase of effective dimensionality.
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