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- W1990648300 abstract "Measurements of the nuclear-spin-lattice relaxation time ${T}_{1}$ for $^{31}mathrm{P}$ are presented for all of the paramagnetic rare-earth (RE) monophosphides except PmP, at 76 and 300ifmmode^circelsetextdegreefi{}K. This is the first case where such measurements have been reported for the full RE series of an intermetallic compound. The data reflect the paramagnetic fluctuation spectra of the respective RE electronic angular momenta. These fluctuation spectra depend, in turn, on the strength of the RE-RE exchange interaction and on the configuration of the magnetic levels in the cubic crystalline field. For the cases of CeP, PrP, SmP, EuP, GdP, and YbP, we have developed explicit relations between ${T}_{1}$ and the exchange parameter, and have used these relations to determine the exchange strength. EuP is shown to be unique in that transitions between different spin-orbit levels of the Eu ion dominate the fluctuation spectrum, and consequently the way in which the total exchange interaction depends on the spin and orbital states of the RE ion directly affects ${T}_{1}$. The form $mathcal{S}{stackrel{ensuremath{rightarrow}}{mathrm{S}}}_{1}ifmmodecdotelsetextperiodcenteredfi{}{stackrel{ensuremath{rightarrow}}{mathrm{S}}}_{2}$ for the exchange interaction, with $stackrel{ensuremath{rightarrow}}{mathrm{S}}$ being the total ionic spin and $mathcal{S}$ approximately invariant across the RE phosphide series, is inconsistent with the data. Instead, the exchange coupling depends in a more complex way on the $f$-shell occupation." @default.
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- W1990648300 date "1974-01-01" @default.
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- W1990648300 title "Study of paramagnetic spin fluctuations in the rare-earth monophosphides via pulsed NMR" @default.
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- W1990648300 doi "https://doi.org/10.1103/physrevb.9.227" @default.
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