Observation of Colossal Terahertz Magnetoresistance and Magnetocapacitance in a Perovskite Manganite

We have studied the terahertz response of a bulk single crystal of La\(_{0.875}\)Sr\(_{0.125}\)MnO\(_3\) at around its Curie temperature, observing large changes in the real and imaginary parts of the optical conductivity as a function of magnetic field. The terahertz resistance and capacitance extr...

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Bibliographic Details
Published in:arXiv.org 2023-03
Main Authors: Tay, Fuyang, Chaudhary, Swati, He, Jiaming, Nicolas Marquez Peraca, Baydin, Andrey, Fiete, Gregory A, Zhou, Jianshi, Kono, Junichiro
Format: Article
Language:English
Subjects:
Colossal magnetoresistance
Curie temperature
Magnetic fields
Magnetoresistivity
Manganites
Perovskites
Single crystals
Terahertz frequencies
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Summary:We have studied the terahertz response of a bulk single crystal of La\(_{0.875}\)Sr\(_{0.125}\)MnO\(_3\) at around its Curie temperature, observing large changes in the real and imaginary parts of the optical conductivity as a function of magnetic field. The terahertz resistance and capacitance extracted from the optical conductivity rapidly increased with increasing magnetic field and did not show any sign of saturation up to 6 T, reaching 60% and 15%, respectively, at 180 K. The observed terahertz colossal magnetoresistance and magnetocapacitance effects can be qualitatively explained by using a two-component model that assumes the coexistence of two phases with vastly different conductivities. These results demonstrate the potential use of perovskite manganites for developing efficient terahertz devices based on magnetic modulations of the amplitude and phase of terahertz waves.
ISSN:2331-8422
DOI:10.48550/arxiv.2303.13820