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• W2071569808 abstract "Mossbauer ${(}^{151}mathrm{Eu})$, magnetization, resistivity, and x-ray diffraction measurements of ${mathrm{Eu}}_{2}{mathrm{VO}}_{4}$ at temperatures ranging from 4.2 to 550 K have been carried out. The low-temperature measurements show that in ${mathrm{Eu}}_{2}{mathrm{VO}}_{4}$ (space group $I4/mmm)$ there are divalent and trivalent europium ions (1:1) distributed in equivalent sites. The divalent Eu ions order magnetically at ${T}_{c}$=8 K (evidenced by both Mossbauer and magnetization measurements) and the trivalent europium ions experience an exchange field, which produces a hyperfine field, 80 kOe, in quantitative agreement with theoretical expectations. On warming from 440 to 450 K there is an onset of fast electron hopping between ${mathrm{Eu}}^{2+}$ and ${mathrm{Eu}}^{3+}$ sites, which results in an averaging out of the Mossbauer spectrum. The Mossbauer spectra above 450 K can be fitted by assuming a sudden reduction of the activation energy to an average value of 0.33 eV, with a Gaussian or binomial distribution. The Mossbauer absorption area data follow a Debye curve with ${ensuremath{theta}}_{D}$=220 K, with an anomaly at the temperature of the valence-phase transition. The phase transition is evidenced also in the resistivity measurements which show a sharp increase in conductivity at the transition temperature. Powder x-ray diffraction studies show no crystallographic phase transition at the valence averaging phase transition, however a sharp increase in lattice parameters (1.1% in c and 0.26% in a) is observed." @default.
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• W2071569808 date "1999-04-01" @default.
• W2071569808 modified "2023-10-16" @default.
• W2071569808 title "First-order valence averaging phase transition and magnetism of europium inEu2VO4" @default.
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• W2071569808 doi "https://doi.org/10.1103/physrevb.59.8732" @default.
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