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- W2000559363 abstract "The magnetic excitation spectra of Gd were measured by neutron inelastic scattering over the entire Brillouin zone in the 〈110〉 direction at temperatures from 250 to 850 K (${T}_{c}$=293 K). The data were fitted to a damped-harmonic-oscillator form for the spectral weight function and were placed on an absolute cross-section basis. Wave-vector-dependent susceptibilities were obtained by integration over energy. They clearly show the presence of static spin correlations even at T=850 K. At Tensuremath{ge}${T}_{c}$ we observe a crossover from spin-diffusive motion at small q to spin-wave behavior at large q. The wave vector ${q}_{c}$ at which this crossover occurs is determined by the ratio of the damping parameter to the second moment, 〈${ensuremath{omega}}^{2}$〉, of the frequency distribution. Surprisingly, 〈${ensuremath{omega}}^{2}$〉 remains independent of temperature above ${T}_{c}$, and the temperature dependence of ${q}_{c}$ is therefore determined by a gradual change in the damping. This results in a very weak ${q}_{c}$-versus-T dependence, which is not consistent with a magnetic short-range-order interpretation for the existence of spin waves above ${T}_{c}$." @default.
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- W2000559363 date "1989-06-01" @default.
- W2000559363 modified "2023-09-23" @default.
- W2000559363 title "Spin dynamics of Gd at high temperatures" @default.
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- W2000559363 doi "https://doi.org/10.1103/physrevb.39.11732" @default.
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