Magnetodielectric consequences of phase separation in the colossal magnetoresistance manganite Pr0.7Ca0.3MnO3

Abstract

We have studied the low-frequency dielectric properties of the phase-separated manganite Pr0.7Ca0.3MnO3 as a function of applied magnetic field in the low temperature phase-separated state. The dielectric constant is strongly field dependent and also depends on the magnetic field history of the sample. The dielectric behavior appears to be associated with the hopping of polaronic charge carriers, and we can derive the field dependent hopping energy barrier from the frequency dependence of the dielectric constant. This analysis allows us to associate the metal-insulator transition observed in this material with the field-induced suppression of the polaron activation energy.

arXiv comment19 pages, 6 figures, to be published in Physical Review B

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• Doping Dependence of Polaron Hopping Energies in La(1-x)Ca(x)MnO(3) (0<= x<= 0.15)
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• Scaling of THz-conductivity at metal-insulator transition in doped manganites
• Magneto-optical investigation of the field-induced spin-glass insulator to ferromagnetic metallic transition of the bilayer manganite (La${}_{0.4}$Pr${}_{0.6}$)${}_{1.2}$Sr${}_{1.8}$Mn${}_2$O${}_7$
• Glassy dielectric anomaly and negative magneto-capacitance effect in electron-doped Ca${}_{1-x}$Sr${}_x$Mn${}_{0.85}$Sb${}_{0.15}$O${}_3$
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• Magnetic field induced dielectric relaxation in the strain glass state of Pr0.6Ca0.4MnO3
• Competing `soft' dielectric phases and detailed balance in thin film manganites