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- W1975115087 abstract "Two $B$-site ordered double perovskites, ${text{Ba}}_{2}{text{YRuO}}_{6}$ and ${text{La}}_{2}{text{LiRuO}}_{6}$, have been reinvestigated as part of a systematic study of geometric magnetic frustration in this class of oxide materials. Both involve ${text{Ru}}^{5+}(4{d}^{3},S=3/2)$ as the magnetic ion residing on a face-centered-cubic lattice---one of the canonical frustrated lattices. Results from dc susceptibility, neutron-diffraction, heat-capacity, $^{7}text{L}text{i}$ and $^{89}text{Y}$ NMR studies are presented. ${text{La}}_{2}{text{LiRuO}}_{6}$ $(P{2}_{1}/n)$ shows long-range antiferromagnetic order below 24 K from $^{7}text{L}text{i}$ NMR, heat-capacity and magnetic-susceptibility (Fisher's heat-capacity) data which is well below the susceptibility maximum at 30 K. Analysis of the entropy loss and the $^{7}text{L}text{i}$ data indicates the importance of short-range spin correlations at higher temperatures, consistent with a frustrated system. ${text{Ba}}_{2}{text{YRuO}}_{6}$ retains $Fm3m$ symmetry found at room temperature down to 2.8 K with cell constants, $a=8.33559(9)$ and $a=8.3239(5)text{ }text{AA{}}$, respectively. However, $^{89}text{Y}$ magic-angle-spinning NMR detects a very low $ensuremath{sim}1%$ site mixing between Y and Ru ions. Magnetic-susceptibility data are more complex than reported previously with two broad peaks around 37 and 47 K. The transition temperature is 36 K from heat capacity and variable-temperature neutron-diffraction data. The Weiss temperatures and frustration indices, $|ensuremath{theta}|/{T}_{text{N}}$, for ${text{Ba}}_{2}{text{YRuO}}_{6}$ are $ensuremath{-}522$ K and 16 while much smaller values are observed for ${text{La}}_{2}{text{LiRuO}}_{6}$, $ensuremath{-}184$ K and 8, which can be attributed to the monoclinic structural distortion in the latter which weakens the superexchange interactions." @default.
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- W1975115087 date "2009-10-28" @default.
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- W1975115087 title "Magnetic properties of the<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:mi>S</mml:mi><mml:mo>=</mml:mo><mml:mstyle scriptlevel=1><mml:mfrac bevelled=false><mml:mn>3</mml:mn><mml:mn>2</mml:mn></mml:mfrac></mml:mstyle></mml:mrow></mml:math>geometrically frustrated double perovskites<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mtext>La</mml:mtext></mml:mrow><mml:mn>2</mml:mn></mml:msub><…" @default.
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