Abstract
We discuss two topics on the phenomena depending on the magnetic field orientation in low-dimensional conductors: (1) Angular dependence of field-induced spin-density-wave (FISDW) in quasi-one-dimensional (Q1D) conductors, and (2) angular-dependent magnetoresistance oscillation (Yamaji oscillations) in quasi-two-dimensional (Q2D) conductors without coherent interlayer coupling. The threshold fields of FISDW transition in an organic Q1D conductor (TMTSF) 2ClO 4 shows sharp decreases at Lebed's magic angles. We extend the “standard theory” of FISDW for the three-dimensional system, and try to explain this feature. We prepared a series of GaAs/AlGaAs superlattices with various interlayer couplings, and experimentally show that the Yamaji oscillations appear even in the Q2D system without coherent interlayer coupling.
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