Abstract
Electrical resistivity behavior of single crystals as well as polycrystalline pellets of rare earth manganates has been investigated below the charge-ordering temperatures to understand the mechanism of conduction. The resistivity of both the single- and polycrystalline samples of Gd 0.5 Ca 0.5 MnO 3 and Nd 0.5 Ca 0.5 MnO 3 obey the T −1/4 law, characteristic of variable range hopping. A similar dependence is found in the hole-doped Pr 0.6 Ca 0.4 MnO 3 as well, but the data of the electron-doped Pr 0.4 Ca 0.6 MnO 3 do not seem to obey any T −1/ n law satisfactorily. AC conductivity measurements also reflect the unusual nature of the electron-doped composition. Graphic
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