Abstract
The structure, electrical and magnetic transport properties of polycrystalline La 4/3Sr 5/3Mn 2O 7 synthesized by a sol–gel method were studied. The X-ray diffraction (XRD) shows that the obtained sample forms with Sr 3Ti 2O 7-type perovskite structure. The resistivity versus temperature ( ρ– T) curve shows that the insulator–metal transition occurs at ∼120 K, coincident with the three-dimension (3D) ferromagnetic (FM) ordering temperature observed in the measurement of magnetization and ac magnetic susceptibility ( χ ac). Except the insulator–metal transition at ∼120 K, there is another insulator–metal transition below 120 K and the feature is especially obvious in a field of 5 T. As a circumstantial evidence, the ρ– T curves in zero field and a field of 5 T of the Ca- or Ba-doped sample is measured and there is only one insulator–metal transition in both cases. The results can be explained by that the Ca- or Ba-doped sample is purer than La 4/3Sr 5/3Mn 2O 7.
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