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- W2029069939 abstract "The magnetic interactions in LiTb${mathrm{F}}_{4}$ have been studied in measurements of the quasielastic scattering of neutrons from the paramagnetic crystal. Scattering data have been collected at a temperature $T=18.6$ K, which is 6.5 times the Curie temperature of LiTb${mathrm{F}}_{4}$, and have been least-squares fitted with an expression for the scattering cross section which includes, in addition to the dominant dipolar coupling, two exchange parameters ${J}_{1}$ and ${J}_{2}$ describing the nondipolar coupling between nearest- and next-nearest-neighbor ${mathrm{Tb}}^{3+}$ ions, respectively. The derived exchange parameters are $frac{{J}_{1}}{k}=ensuremath{-}0.26ifmmodepmelsetextpmfi{}0.09$ K and $frac{{J}_{2}}{k}=+0.05ifmmodepmelsetextpmfi{}0.10$ K. Based on these parameters the total interaction energy for nearest-neighbor ions is 4/3 dipolar and -1/3 nondipolar, and the nondipolar interactions are less important for second neighbors. The interaction Hamiltonian is discussed, the wave-vector-dependent susceptibility ${ensuremath{chi}}_{T}(stackrel{ensuremath{rightarrow}}{mathrm{Q}})$ is derived in the mean-field approximation, and the dipolar interactions are evaluated numerically using Ewald's technique." @default.
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- W2029069939 date "1975-07-01" @default.
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- W2029069939 title "Dipolar and nondipolar interactions in LiTb<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>F</mml:mi></mml:mrow><mml:mrow><mml:mn>4</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>" @default.
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- W2029069939 doi "https://doi.org/10.1103/physrevb.12.180" @default.
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