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• W2063485100 abstract "We report the crystal structure, magnetization and neutron scattering measurements on the double perovskite Ba$_2$YOsO$_6$. The $Fmoverline{3}m$ space group is found both at 290~K and 3.5~K with cell constants $a_0 = 8.3541(4)$~{AA} and $8.3435(4)$~AA, respectively. Os$^{5+}$ ($5d^3$) ions occupy a non-distorted, geometrically frustrated face-centered-cubic (FCC) lattice. A Curie-Weiss temperature $theta = -772$~K suggests the presence of a large antiferromagnetic interaction and a high degree of magnetic frustration. A magnetic transition to long range antiferromagnetic order, consistent with a Type I FCC state below $T_{rm N} sim 69$~K, is revealed by magnetization, Fisher heat capacity and elastic neutron scattering, with an ordered moment of 1.65(6)~$mu_B$ on Os$^{5+}$. The ordered moment is much reduced from either the expected spin only value of $sim 3 mu_B$ or the value appropriate to $4d^3$ Ru$^{5+}$ in isostructural Ba$_2$YRuO$_6$ of 2.2(1)~$mu_B$, suggesting a role for spin orbit coupling (SOC). Triple axis neutron scattering measurements of the order parameter suggest an additional first-order transition at $T = 67.45$~K, and the existence of a second ordered state. % Time-of-flight inelastic neutron results reveal a large spin gap $Delta sim 17$~meV, unexpected for an orbitally quenched, $d^3$ electronic configuration. We discuss this in the context of the $sim 5$~meV spin gap observed in the related Ru$^{5+}$, $4d^3$ cubic double perovskite Ba$_2$YRuO$_6$, and attribute the $sim 3$ times larger gap to stronger SOC present in this heavier, $5d$, osmate system." @default.
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• W2063485100 date "2015-02-26" @default.
• W2063485100 modified "2023-09-27" @default.
• W2063485100 title "Frustrated fcc antiferromagnet<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:mrow><mml:msub><mml:mi>Ba</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>YOsO</mml:mi><mml:mn>6</mml:mn></mml:msub></mml:mrow></mml:math>: Structural characterization, magnetic properties, and neutron scattering studies" @default.
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• W2063485100 doi "https://doi.org/10.1103/physrevb.91.075133" @default.
• W2063485100 hasPublicationYear "2015" @default.
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