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Title: Giant magnetocapacitance in cerium sesquioxide
Authors: Kolodiazhnyi, T
Sakurai, H
Avdeev, M
Charoonsuk, T
Lamonova, KV
Pashkevich, YG
Kennedy, BJ
Keywords: Neutron diffraction
Specific heat
Phase transformations
Dielectric properties
Issue Date: 22-Aug-2018
Publisher: American Physical Society
Citation: Kolodiazhnyi, T., Sakurai, H., Avdeev, M., , Lamonova, K. V., Pashkevich, Y. G., & Kennedy, B. J. (2018). Giant magnetocapacitance in cerium sesquioxide. Physical Review B, 98(5), 054423. doi:10.1103/PhysRevB.98.054423
Abstract: We report structural, magnetic, magnetodielectric, and specific heat properties of hexagonal polymorph of Ce2O3. The A-type hexagonal Ce2O3 crystallizes in the P¯32/m1 space group and shows antiferromagnetic ordering at TN≈6.2 K as detected by magnetic susceptibility measurements. The magnetic ordering is accompanied by a λ-shape specific heat anomaly with a peak maximum at T≈6.1 K. An isotropic dielectric constant demonstrates a large magnetocapacitance effect at T=TN, which saturates at ∼80 kOe. In the magnetically ordered phase the relaxation rate of the dielectric polarization increases with the magnetic field and shows divergence as the temperature approaches TN. The magnetic calculations indicate that Ce 2O3 undergoes “easy plane” AFM ordering, which is also supported by the neutron diffraction data. ©2018 American Physical Society
ISSN: 2469-9969
Appears in Collections:Journal Articles

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