Interplay of Spin-Orbit Interaction and Electron Correlation on the Van Vleck Susceptibility in Transition Metal Compounds

Abstract

We have studied the effects of electron correlation on Van Vleck susceptibility (${\chi }_{\mathrm{VV}}$) in transition metal compounds. A typical crossover behavior is found for the correlation effect on ${\chi }_{\mathrm{VV}}$ as sweeping spin-orbit interaction, $\lambda$. For a small $\lambda$, orbital fluctuation plays a dominant role in the correlation enhancement of ${\chi }_{\mathrm{VV}}$; however, the enhancement rate is rather small. In contrast, for an intermediate $\lambda$, ${\chi }_{\mathrm{VV}}$ shows a substantial increase, accompanied by the development of spin fluctuation. We will discuss the behavior of ${\chi }_{\mathrm{VV}}$ in association with the results of Knight-shift experiments on Sr${}_2$RuO${}_4$ and an anomalously large magnetic susceptibility observed for $5d$ Ir compounds.

5 pages, 3 figures, to appear in J. Phys. Soc. Jpn

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