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- W2351036169 abstract "The two-layered perovskite manganites La1.34Sr1.66Mn2-xCrxO7(x=0,0.1,0.3,0.4) were prepared by a standard solid-state reaction method.The XRD patterns indicate that all samples can be indexed to a tetragonal Sr3Ti2O7 type sturcture with a space group I4/mmm.The cell volume V of the samples decreases monotonically with increasing Cr3+ ion concentration.For lightly Cr3+ doped sample(x=0.1),the three-dimensional long-range ordering ferromagnetic transition temperature T3Dc increases,while the two-dimensional short-range ordering ferromagnetic transition temperature T2Dc decreases.A minimum of the c parameter,a maximum of the a parameters and a minimum of the c/a ratio were found in the x=0.1 sample.The change of the double-exchange-interaction resulting from the serious lattice distortion is the main cause of the variation of the magnetic ordering transition temperatures in this sample.For the heavily Cr3+doped samples(x=0.3,and 0.4),T3Dc decreases,but T2Dc almost remains stable.The resistivity increases with decreasing temperature in the range of 150～300 K,showing a insulating or semiconductor behaviour.The resistivity increases monotonically with increasing Cr3+ doping level." @default.
- W2351036169 created "2016-06-24" @default.
- W2351036169 creator A5072818976 @default.
- W2351036169 date "2009-01-01" @default.
- W2351036169 modified "2023-09-23" @default.
- W2351036169 title "Magnetic and Transport Properties in Two-layered Perovskite Manganites La_(1.34)Sr_(1.66)Mn_(2-x)Cr_xO_7" @default.
- W2351036169 hasPublicationYear "2009" @default.
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