Invalidity of Classes of Approximated Hall Effect Calculations

Abstract

In this comment, I point out a number of approximated derivations for the effective equation of motion, now been applied to d-wave superconductors by Kopnin and Volovik are invalid. The major error in those approximated derivations is the inappropriate use of the relaxation time approximation in force-force correlation functions, or in force balance equations, or in similar variations. This approximation is wrong and unnecessary.

final version, minor changes, to appear in Phys. Rev. Lett

References in corpus (1)

• Flux-flow in d-wave superconductors: Low temperature universality and scaling

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