Analysis of four-terminal magnetoresistance data (published recently) from single-crystal cylinders of potassium indicates that open orbits, created by a charge-density-wave structure, are present. Apparent negative resistance for some orientations of the magnetic field shows that large charge-density-wave Q domains can cause the current to follow a serpentine path having a reversed direction between the voltage contacts.
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A. W. Overhauser (1987) studied this question.
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