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- W99582007 abstract "The antiferromagnetic ordering and crystal structure of the clathrate compound ${mathrm{Eu}}_{4}{mathrm{Ga}}_{8}{mathrm{Ge}}_{16}$ was investigated using multitemperature neutron and synchrotron x-ray powder diffraction. High-resolution low-Q neutron data were measured at long wavelength $(ensuremath{lambda}=4.2AA{})$ between 1.5 and 15 K for an accurate description of the magnetic structure, whereas high-Q diffraction patterns were collected using neutrons of wavelength 1.9 AA{} at the same temperatures to determine the nuclear structure precisely. The structure orders antiferromagnetically at about 8 K with ferromagnetic chains parallel to the a axis. The intrachain Eu-Eu distance, 4.1216(1) AA{} at 1.5 K, is significantly shorter than the distance observed in the ferromagnetic clathrates $ensuremath{beta}ensuremath{-}{mathrm{Eu}}_{8}{mathrm{Ga}}_{16}{mathrm{Ge}}_{30}$ (5.23 AA{}) and $ensuremath{alpha}ensuremath{-}{mathrm{Eu}}_{8}{mathrm{Ga}}_{16}{mathrm{Ge}}_{30}$ (5.56 AA{}). Antiferromagnetic coupling to the nearest and next-nearest chains at distances of 5.99 and 6.98 AA{}, respectively, leads to an overall antiferromagnetic structure. A fit to a power law of the temperature dependence of the ordered ${mathrm{Eu}}^{2+}$ magnetic moment results in a moment of $7.01(7){ensuremath{mu}}_{B}$ at 0 K in agreement with the $7{ensuremath{mu}}_{B}$ for the free ion value of ${mathrm{Eu}}^{2+}.$ The temperature dependence of the crystal structure was investigated from 11 K to room temperature using synchrotron x-ray powder diffraction. Analysis of the atomic displacement parameters with Einstein and Debye models gives ${ensuremath{Theta}}_{E}=82(3)mathrm{K}$ for the guest atom and ${ensuremath{Theta}}_{D}=266(4)mathrm{K}$ for the framework atoms. Based on ${ensuremath{Theta}}_{D}$ the lattice contribution to thermal conductivity is estimated to be 0.0125 W/cm K." @default.
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- W99582007 date "2003-11-25" @default.
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- W99582007 title "Crystal and magnetic structure of<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>Eu</mml:mi></mml:mrow><mml:mrow><mml:mn>4</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>Ga</mml:mi></mml:mrow><mml:mrow><mml:mn>8</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>Ge</mml:mi></mml:mrow><mml:mrow><mml:mn>16</mml:…" @default.
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- W99582007 doi "https://doi.org/10.1103/physrevb.68.174428" @default.
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