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• W2000261854 startingPage "6399" @default.
• W2000261854 abstract "The crystal structure and its variation with temperature of the spin-charge coupled material ${mathrm{Tl}}_{2}$ ${mathrm{Mn}}_{2}$ ${mathrm{O}}_{7}$ pyrochlore is investigated. Structure refinement from the neutron powder-diffraction data reveals that ${mathrm{Tl}}_{2}$ ${mathrm{Mn}}_{2}$ ${mathrm{O}}_{7}$ has nearly stoichiometric composition and is crystallized in the cubic-pyrochlore-type structure with a characteristic Mn-O-Mn bond angle of 133ifmmode^circelsetextdegreefi{}. There is no structural anomaly associated with the change in magnetotransport properties at 142 K, suggesting weak spin-lattice and charge-lattice correlations. Despite the similarity of magnetotransport properties observed in the perovskite and the pyrochlore colossal magnetoresistance manganese oxides, the double-exchange mechanism, which is usually applied to the perovskite materials, does not seem to explain the behavior in the pyrochlore ${mathrm{Tl}}_{2}$ ${mathrm{Mn}}_{2}$ ${mathrm{O}}_{7}$ compound. A superexchange-type interaction may stabilize the ferromagnetic ordering of Mn spins and cause the metallic conduction at low temperatures in ${mathrm{Tl}}_{2}$ ${mathrm{Mn}}_{2}$ ${mathrm{O}}_{7}$ ." @default.
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• W2000261854 date "1997-03-01" @default.
• W2000261854 modified "2023-09-28" @default.
• W2000261854 title "Structural and magnetotransport properties of the colossal magnetoresistance material<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>Tl</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>Mn</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></…" @default.
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• W2000261854 doi "https://doi.org/10.1103/physrevb.55.6399" @default.
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