What Does The Korringa Ratio Measure?

Details What Does The Korringa Ratio Measure? What Does The Korringa Ratio Measure?

1993-07-21

arxiv.org/abs/cond-mat/9307047v1

Physics

Condensed Matter

849, Piscataway, New Jersey 08855 24 June 1993

Scientific paper

10.1103/PhysRevLett.72.1933

We present an analysis of the Korringa ratio in a dirty metal, emphasizing the case where a Stoner enhancement of the uniform susceptibilty is present. We find that the relaxation rates are significantly enhanced by disorder, and that the inverse problem of determining the bare density of states from a study of the change of the Knight shift and relaxation rates with some parameter, such as pressure, has rather constrained solutions, with the disorder playing an important role. Some preliminary applications to the case of chemical substitution in the Rb$_{3-x}$K$_x $C$_{60}$ family of superconductors is presented and some other relevant systems are mentioned.

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