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- W176230481 abstract "EPR in excited crystal-field states of Tm/sup 3 +/, Pr/sup 3 +/, and Tb/sup 3 +/ in singlet-ground-state systems and in the excited state of Ce/sup 3 +/ in CeP are reviewed. Because one is looking at a crystal-field excited state resonance, the exchange, even if isotropic, does not act as a secular perturbation. This means that one obtains different effects and has access to more information about the dynamic effects of exchange than in conventional paramagnetic resonance experiments. The Tm and Pr monopnictides studied are paramagnetic at all temperatures. The most striking feature of the behavior of the GAMMA/sub 5//sup (2)/ EPR in the Tm compounds is the presence of an anomalous maximum in the temperature dependence of the g-factor. The relationship of this effect to anisotropic exchange is discussed. The results of the EPR of the excited GAMMA/sub 5//sup (2)/ level of Tb/sub 3//sup +/ (g-factor becomes very large at T/sub N/ in antiferromagnetic TbX (X = P, As, Sb) and that of the excited GAMMA/sub 8/ level of Ce/sup 3 +/ in antiferromagnetic CeP will also be reported. For sufficient dilution of the Tb/sup 3 +/ in the terbium monopnictides, the systems become paramagnetic (Van Vleck paramagnets)more » down to 0/sup 0/K. The Tb/sup 3 +/ excited state resonance EPR in Tb/sub 0.1/ La/sub 0.9/P was studied as an example of behavior in such systems. 10 fig.« less" @default.
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- W176230481 date "1976-01-01" @default.
- W176230481 modified "2023-09-27" @default.
- W176230481 title "EPR studies of excited state exchange and crystal-field effects in rare earth compounds. [Pnictides]" @default.
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