Abstract
The La0.7Ba0.3MnO3 compound, obtained in volume by sol–gel with a cubic crystal lattice, exhibits metal–insulator phase transitions near 336K and a ferromagnetic–paramagnetic transition near 375K. The correlation between the magnetic and transport properties is evidenced by AC susceptibility measurements, impedance spectroscopy and DC conductivity. The activation energy values obtained by impedance spectroscopy and by the four-point method differed slightly. The real part of the conductivity σ′(ω) for different temperatures showed a plateau (DC regime) for various frequency decades followed by a dispersive region following a Jonscher's power law tendency. The value of the exponent n, which was less than one, showed a distribution of relaxation times. The cross-frequency ωp, which was associated with the carrier hopping frequency, showed a thermally activated tendency with an almost constant carrier density for the entire range of temperatures. The relaxation time distribution was also verified by the dielectric modulus M(ω).
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