Abstract
Field-induced spin density wave (FISDW) systems exhibit coexistence phases between well-defined Quantum Hall plateaux phases with even integers 2 N and 2 N′. We show that a disordered coexistence region accounts for the observed peaks in the longitudinal reisitivity as the field varies between plateaux. It also results in a random spin mixing which yields two energy-split extended states. The longitudinal resistance is expected to show two peaks with a temperature ( T) dependent width ∼ T κ . The peak width should saturate below the non-nesting interlayer coupling of ≈40 mK.
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