Magnetic field-dependent dielectric constant in La2/3Ca1/3MnO3
J. Rivas, J. Mira, B. Rivas-Murias, A. Fondado, J. Dec, W. Kleemann,, M. A. Senaris Rodriguez
TL;DR
This study demonstrates a significant magnetic field influence on the dielectric constant of La2/3Ca1/3MnO3, with a 30% change near the Curie temperature, linked to interfacial polarization effects.
Contribution
It reveals a strong magnetic field-dependent dielectric response in La2/3Ca1/3MnO3, highlighting the role of intrinsic phase segregation and interfacial polarization.
Findings
Dielectric permittivity varies up to 30% under 0.5 T magnetic field.
Maximum variation occurs near 270 K, just above TC.
Attribution to space-charge or interfacial polarization effects.
Abstract
We report a rather high dependence of the dielectric permittivity on the magnetic field in La2/3Ca1/3MnO3. The variation is maximum at around 270 K, little above the Curie temperature, TC, and it reaches a 30% under only 0.5 T. We attribute this phenomenon to the space-charge or interfacial polarization produced between the insulator and the metallic regions segregated intrinsically in the material above TC.
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