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- W1653028522 abstract "We have investigated transport and magnetic properties of a series of double-perovskite alloys in the system Sr2FeMoxW1-xO6. These compounds exhibit a metal-insulator transition as a function of doping, x. The compounds with x in the range 1.0⩾x⩾0.3 show metallic behaviour in the resistivity while compounds with x in the range 0.2⩾x⩾0 are insulating. All compounds with 1.0⩾x⩾0.2 are ferrimagnetic, while Sr2FeWO6 (x = 0) is antiferromagnetic. The magnetization (M) is shown to increase slowly with decreasing x in the range 1.0⩾x⩾0.3 due to an enhanced crystallographic ordering; however, M decreases rapidly with decreasing x thereafter (x<0.3), probably due to composition fluctuations near the critical concentration, xc. Our data suggest primarily Fe3+-(Mo, W)5+ ordering for x⩾0.3, while compositions with smaller x possibly contain both Fe3+ and Fe2+ species inhomogeneously due to the presence of the W6+ state. All samples with x⩾0.3 show a significant amount of negative magnetoresistance, as has been observed earlier for Sr2FeMoO6 (x = 1.0)." @default.
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- W1653028522 date "2001-01-11" @default.
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- W1653028522 title "Transport and magnetic properties of Sr<sub>2</sub>FeMo<sub><i>x</i></sub>W<sub>1-<i>x</i></sub>O<sub>6</sub>" @default.
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- W1653028522 doi "https://doi.org/10.1088/0953-8984/13/4/307" @default.
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