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We have studied the low-frequency dielectric properties of thephase-separated manganite Pr0.7Ca0.3MnO3 as a function of applied magneticfield in the low temperature phase-separated state. The dielectric constant isstrongly field dependent and also depends on the magnetic field history of thesample. The dielectric behavior appears to be associated with the hopping ofpolaronic charge carriers, and we can derive the field dependent hopping energybarrier from the frequency dependence of the dielectric constant. This analysisallows us to associate the metal-insulator transition observed in this materialwith the field-induced suppression of the polaron activation energy.Comment: 19 pages, 6 figures, to be published in Physical Review

physical review. b, condensed matter and materials physics

Magnetodielectric consequences of phase separation in the colossal magnetoresistance manganite<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi mathvariant="normal">Pr</mml:mi><mml:mn>0.7</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">Ca</mml:mi><mml:mn>0.3</mml:mn></mml:msub><mml:mi mathvariant="normal">Mn</mml:mi><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:mrow></mml:math>

Magnetodielectric consequences of phase separation in the colossal magnetoresistance manganitePr0.7Ca0.3MnO3