A study of supertransferred hyperfine magnetic fields and relaxation of Dy<sup>3+</sup> ions by Mossbauer spectroscopy of <sup>57</sup>Fe and <sup>119</sup>Sn<sup>m</sup> in the pyrochlores Dy<sub>2</sub>Sn<sub>2</sub>O<sub>7</sub> and Dy<sub>2</sub>FeSbO<sub>7</sub>
T J Snee; R E Meads; W G Parker; T J Snee; Dept. of Phys., Univ. of Exeter, Exeter, UK; R E Meads; Dept. of Phys., Univ. of Exeter, Exeter, UK; W G Parker; Dept. of Phys., Univ. of Exeter, Exeter, UK
Журнал:
Journal of Physics C: Solid State Physics
Дата:
1977-05-28
Аннотация:
Temperature-dependent line broadening in the Mossbauer spectra of the pyrochlores Dy<sub>2</sub>FeSbO<sub>7</sub> and Dy<sub>2</sub>Sn<sub>2</sub>O<sub>7</sub> is attributed to a hyperfine interaction at the <sup>119</sup>Sn<sup>m</sup> or <sup>57</sup>Fe nuclei supertransferred via O<sup>2-</sup> ions from Dy<sup>3+</sup>. Relatively slow spin-lattice relaxation of Dy<sup>3+</sup> occurs and the temperature dependence of the relaxation time is consistent with the occurrence of a two-phonon Orbach process.
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