Korringa ratio of ferromagnetically correlated impure metals

Abstract

The Korringa ratio, $\mathcal{K}$, 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. $\mathcal{K}$ varies in a simple way with respect to $U$ and $T$; it decreases as $U$ is increased but increases as $T$ is raised. However, $\mathcal{K}$ varies in a slightly more complicated way with respect to the impurity scatterings; as the scattering rate is increased, $\mathcal{K}$ 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 $\mathcal{K}$.

arXiv comment7 pages including 3 figures. To be published in Phys. Rev. B, Dec. 1

References in corpus (1)

• What Does The Korringa Ratio Measure?

Cited by in corpus (2)

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