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Space-charge driven origin of the reversible pyrocurrent peaks in Cu1-xCdxCr2 O4

Das, A and Pal, R and Mehta, S and Islam, KP and Mondal, A and Pal, AN and Choudhury, D (2024) Space-charge driven origin of the reversible pyrocurrent peaks in Cu1-xCdxCr2 O4. In: Physical Review B, 109 (2).

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Official URL: https://doi.org/10.1103/PhysRevB.109.024104


CuCr2O4, which belongs to the family of AB2O4 spinels, was recently reported to be a type-I multiferroic material. The observations of type-I multiferroicity, i.e., where ferroelectricity (FE) arises from a structural origin, is rare in the AB2O4 spinel family, thus this result is significant. The role of both Jahn-Teller (JT) active Cu2+ and Cr sublattice magnetic ordering was suggested in the earlier study, and a more careful investigation to elucidate the origin of the observed FE is required. With the aim to elucidate the origin of the observed FE, we carried out a detailed investigation of the structural, electrical, and magnetic properties of a Cu1-xCdxCr2O4 (0�x�1) series, that enables an x-dependent controlled tuning of the Cu2+ driven structural and Cr-sublattice driven magnetic transition temperatures. We track and investigate the correlation of the observed pyrocurrent peaks with the temperature-dependent structural and magnetic transitions in this series for various x members. From careful investigations, we rule out any intrinsic origin and establish a space-charge or extrinsic origin for the observed switchable pyrocurrent peaks that point to an absence of ferroelectricity. © 2024 American Physical Society.

Item Type: Journal Article
Publication: Physical Review B
Publisher: American Physical Society
Additional Information: The copyright for this article belongs to American Physical Society.
Keywords: Binary alloys, Electrical and magnetic property; Jahn-Teller; Magnetic transition temperature; Magnetic transitions; Multiferroic materials; Structural origin; Structural transitions; Sub-lattices; Switchable; Temperature dependent, Ferroelectricity
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited: 01 Mar 2024 09:01
Last Modified: 01 Mar 2024 09:01
URI: https://eprints.iisc.ac.in/id/eprint/83952

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