Abstract
We report here the synthesis and results of electrical resistivity and magnetic susceptibility measurements in the low temperature range of the rare-earth-doped bilayered system LnSr2TiFeO7 (Ln = Nd, Gd). Both phases crystallize with a tetragonal unit cell in space group I4/mmm. The phases exhibit insulating behavior, and the electrical transport mechanism agrees with the Mott variable-range hopping model. The decrease in electrical resistivity with decreasing ionic size of the rare-earth ion could be attributed to enhancement of the three-dimensional (3D) character along the c-axis because of the proximity of the (Ti/Fe)O2 and (Ln,Sr)O layers along the c-axis. The magnetic studies suggest that the phases are antiferromagnetic and the antiferromagnetic behavior could be due to the Fe3+-O–Fe3+ exchange interaction.
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