Invalidity of Classes of Approximated Hall Effect Calculations

Details Invalidity of Classes of Approximated Hall Effect Calculations Invalidity of Classes of Approximated Hall Effect Calculations

1998-01-19

arxiv.org/abs/cond-mat/9801180v2

Physics

Condensed Matter

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

Scientific paper

10.1103/PhysRevLett.80.5025

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.

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