Korringa ratio of ferromagnetically correlated impure metals

Details Korringa ratio of ferromagnetically correlated impure metals Korringa ratio of ferromagnetically correlated impure metals

2000-09-05

arxiv.org/abs/cond-mat/0009053v1

Physics

Condensed Matter

Strongly Correlated Electrons

7 pages including 3 figures. To be published in Phys. Rev. B, Dec. 1

Scientific paper

10.1103/PhysRevB.62.15120

The Korringa ratio, $\cal K$, obtained by taking an appropriate combination of the Knight shift and nuclear spin-lattice relaxation time, is calculated at finite temperature, $T$, in the three-dimensional electron gas model, including the electron-electron interaction, $U$, and non-magnetic impurity scatterings. $\cal K$ varies in a simple way with respect to $U$ and $T$; it decreases as $U$ is increased but increases as $T$ is raised. However, $\cal K$ varies in a slightly more complicated way with respect to the impurity scatterings; as the scattering rate is increased, $\cal K$ increases for small $U$ and low $T$, but decreases for large $U$ or high $T$ regime. This calls for a more careful analysis when one attempts to estimate the Stoner factor from $\cal K$.

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