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- W1649133668 abstract "${mathrm{Co}}_{0.7}$${mathrm{Cu}}_{0.15}$${mathrm{Fe}}_{0.15}$${mathrm{Cr}}_{2}$${mathrm{S}}_{4}$ has been studied by Mossbauer spectroscopy, x-ray diffraction, and magnetic measurements. The crystal structure is found to be a cubic spinel with the lattice parameter ${a}_{0}=9.917$ AA{}. Absence of quadrupole splitting suggests that iron ions occupy only tetrahedral sites. It is notable that as the temperature increases toward the N'eel temperature, ${T}_{N}=252$ K, line broadening and a pronounced central peak appear, suggesting superparamagnetic relaxation. The temperature dependence of the effective anisotropy energy is also found to decrease rapidly with increasing temperature, thereby supporting the observed rapid increase of the superparamagnetic relaxation rate below ${T}_{N}$." @default.
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- W1649133668 date "1989-02-01" @default.
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- W1649133668 title "Superparamagnetic relaxation in<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>Co</mml:mi></mml:mrow><mml:mrow><mml:mn>0.7</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>Cu</mml:mi></mml:mrow><mml:mrow><mml:mn>0.15</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math…" @default.
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- W1649133668 doi "https://doi.org/10.1103/physrevb.39.2800" @default.
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