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• W2023443362 abstract "The ordered perovskite ${mathrm{Sr}}_{2}{mathrm{MgReO}}_{6}$ of tetragonal symmetry $[I4/m,$ $a=5.5670(1)AA{},$ $c=7.9318(2)AA{}$ at $T=295mathrm{K}]$ has been synthesized and characterized by x-ray and neutron diffraction, thermal gravimetric analysis dc susceptibility, heat capacity, and muon spin relaxation (ensuremath{mu}SR) experiments. The B site cations ${mathrm{Re}}^{6+}$ and ${mathrm{Mg}}^{2+}$ appear to be ordered due the large difference in formal charge. The ${mathrm{Re}}^{6+}$ magnetic ions form a distorted fcc lattice of $S=frac{1}{2}$ spins providing a frustrated topology of edge-shared tetrahedra. The material exhibits a weak magnetic glassiness shown by a cusp at ensuremath{sim}50 K in the dc susceptibility, a weak but broad heat capacity anomaly, and a low-temperature ensuremath{mu}SR line shape characteristic of a spin-glass state. A broad and strongly field- dependent maximum in the dc susceptibility suggests that magnetic correlations persist to ensuremath{sim}175 K, accompanied by a divergence in the field-cooled and zero-field-cooled susceptibility. The anisotropic nature of the superexchange pathways due to the tetragonal distortion is thought to disrupt the ideal frustrated environment and lead to weaker glassiness than ${mathrm{Sr}}_{2}{mathrm{CaReO}}_{6},$ which has ${T}_{G}ensuremath{sim}14mathrm{K},$ and a large specific heat anomaly. In contrast, ${mathrm{Sr}}_{2}{mathrm{MgReO}}_{6}$ has a small anomaly, and only about 3% of the entropy is released at ${T}_{G}ensuremath{sim}50mathrm{K},$ which is comparable to other unconventional spin glasses such as the jarosite $({mathrm{H}}_{3}mathrm{O}){mathrm{Fe}}_{3}({mathrm{SO}}_{4}{)}_{2}(mathrm{OH}{)}_{6}(ensuremath{sim}6%).$ ${T}_{G}ensuremath{sim}50mathrm{K}$ is unusually high for this class of materials." @default.
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• W2023443362 date "2003-10-07" @default.
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• W2023443362 title "Frustration-driven spin freezing in the<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mi>S</mml:mi><mml:mo>=</mml:mo><mml:mfrac><mml:mrow><mml:mn>1</mml:mn></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:mfrac></mml:math>fcc perovskite<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>Sr</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:…" @default.
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• W2023443362 doi "https://doi.org/10.1103/physrevb.68.134410" @default.
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