Casey Marjerrison

The frustrated fcc antiferromagnet Ba2 YOsO6: Structural characterization, magnetic properties and neutron scattering studies

Here we report the crystal structure, magnetization, and neutron scattering measurements on the double perovskite Ba2 YOsO6. The Fm

Cubic Re6+ (5d1) Double Perovskites, Ba2MgReO6, Ba2ZnReO6, and Ba2Y2/3ReO6: Magnetism, Heat Capacity, μSR, and Neutron Scattering Studies and Comparison with Theory

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Structure and magnetic interactions in the solid solution Ba{sub 3−x}Sr{sub x}Cr{sub 2}O{sub 8}

m space group is found both at 290 K and 3.5 K with cell constants a0=8.3541(4) A and 8.3435(4) A, respectively. Os5+ (5d3) ions occupy a nondistorted, geometrically frustrated face-centered-cubic (fcc) lattice. A Curie-Weiss temperature θ ~₋700 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 TN~69 K, is revealed by magnetization, Fisher heat capacity, and elastic neutron scattering, with an ordered moment of 1.65(6) μB on Os5+. The ordered moment is much reduced from either the expected spin-only value of ~3 μB or the value appropriate to 4d3 Ru5+ in isostructural Ba2 YRuO6 of 2.2(1) μB, 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. We find time-of-flight inelastic neutron results reveal a large spin gap Δ~17 meV, unexpected for an orbitally quenched, d3 electronic configuration. In conclusion, we discuss this in the context of the ~5 meV spin gap observed in the related Ru5+,4d3 cubic double perovskite Ba2YRuO6, and attribute the ~3 times larger gap to stronger SOC present in this heavier, 5d, osmate system.

Frustrated magnetism in the double perovskite L a 2 LiOs O 6 : A comparison with L a 2 LiRu O 6

The geometrically frustrated double-perovskite Ba

Diffuse magnetic neutron scattering in the highly frustrated double perovskite Ba2YRuO6

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Magnetic ground states in the three Os6+(5d2) double perovskites Ba2MOsO6(M=Mg,Zn,and Cd) from Néel order to its suppression

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Structure and Magnetic Properties of KRuO4

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Structure and magnetic interactions in the solid solution Ba3−xSrxCr2O8

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