Abstract
In an ESR study on the rare-earth ion ${\mathrm{Er}}^{3+}$ in the intermediate-valence single crystal Sm${\mathrm{B}}_{6}$ a spectrum is found which is markedly different from those of comparable systems with integral valence. We analyze the unusual experimental results in terms of a dynamic Jahn-Teller effect in the ${\ensuremath{\Gamma}}_{8}$ cubic-crystal-field ground state. The characteristic features of our experimental data are well reproduced by the calculations, which suggest that the substitutional rare-earth ion ${\mathrm{Er}}^{3+}$ suffers enhanced electron-phonon coupling mediated by the valence-fluctuating host.
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