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

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We have studied the effects of electron correlation on Van Vleck susceptibility ($\chi_{\text{VV}}$) in transition metal compounds. A typical crossover behavior is found for the correlation effect on $\chi_{\text{VV}}$ as sweeping spin–orbit interaction, $\lambda$. For a small $\lambda$, orbital fluctuation plays a dominant role in the correlation enhancement of $\chi_{\text{VV}}$; however, the enhancement rate is rather small. In contrast, for an intermediate $\lambda$, $\chi_{\text{VV}}$ shows a substantial increase, accompanied by the development of spin fluctuation. We will discuss the behavior of $\chi_{\text{VV}}$ in association with the results of Knight-shift experiments on Sr2RuO4 and an anomalously large magnetic susceptibility observed for 5d Ir compounds.
2010-12-15