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- W2004366704 abstract "Recoilless absorption measurements of the 14.4-keV $ensuremath{gamma}$ rays of ${mathrm{Fe}}^{57}$ and the 21.6-keV $ensuremath{gamma}$ rays of ${mathrm{Eu}}^{151}$ in europium iron-gallium garnets (${mathrm{Eu}}_{3}{mathrm{Ga}}_{x}{mathrm{Fe}}_{5ensuremath{-}x}{mathrm{O}}_{12}$) were carried out at 4.2ifmmode^circelsetextdegreefi{}K for $x=0,0.66,1.28,1.60,2.37,mathrm{and} 3.03$. The iron concentrations in the octahedral and tetrahedral sites were determined from the ${mathrm{Fe}}^{57}$ spectra. The results show that about 80% of the Ga ions occupy tetrahedral sites (ensuremath{sim}85% for $x=0.66$ and ensuremath{sim}75% for $x=3.03$). The analysis of the ${mathrm{Eu}}^{151}$ spectra shows that (88ifmmodepmelsetextpmfi{}4)% of the exchange field acting on an ${mathrm{Eu}}^{3+}$ ion in europium iron garnet is produced by the two nearest iron neighbors in the tetrahedral site, although the Eu-O-Fe angle for these ions is 92ifmmode^circelsetextdegreefi{}, an angle often considered unfavorable for superexchange interactions. Excellent agreement between theoretical and experimental spectra is obtained assuming that the remaining 12% of the exchange field is produced by the 4 third nearest neighbors in the tetrahedral site." @default.
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- W2004366704 date "1967-01-10" @default.
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- W2004366704 title "Rare-Earth-Iron Exchange Interactions in Europium Iron Garnet" @default.
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- W2004366704 doi "https://doi.org/10.1103/physrev.153.409" @default.
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