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Structural, magnetic, and spin dynamical properties of the polar antiferromagnets Ni3−xCoxTeO6(x=1,2)

Skiadopoulou, Stella, Retuerto, Maria, Borodavka, Fedir, Kadlec, Christelle, Kadlec, Filip, Míšek, Martin, Prokleška, Jan, Deng, Zheng, Tan, Xiaoyan, Frank, Corey, and others. (2020) Structural, magnetic, and spin dynamical properties of the polar antiferromagnets Ni3−xCoxTeO6(x=1,2). Physical Review B, 101 (1). ISSN 2469-9950. E-ISSN 2469-9969. (doi:10.1103/PhysRevB.101.014429) (KAR id:79663)

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https://doi.org/10.1103/PhysRevB.101.014429

Abstract

We present results of a multimethod investigation of the polar antiferromagnets N i 2 CoTe O 6 and NiC o 2 Te O 6 , inspired by the colossal magnetoelectric effect present in N i 3 Te O 6 . Both compounds crystalize in the same polar space group R 3 as N i 3 Te O 6 , preserving the crystal symmetry at least from room temperature down to 2 K. N i 2 CoTe O 6 and NiC o 2 Te O 6 undergo antiferromagnetic phase transitions at T N = 55 and 52 K, and spin-flop transitions at an external magnetic field of approximately 8 and 4 T, respectively. Both compounds present an incommensurate antiferromagnetic helical structure with spins lying in the a b plane, in contrast to the collinear one along the c axis in N i 3 Te O 6 . Moreover, dielectric anomalies are observed at their antiferromagnetic phase transitions, suggesting a magnetoelectric behavior. Spin and lattice dynamics studies by a combination of infrared, Raman, and terahertz spectroscopies were performed. Below T N , in both N i 2 CoTe O 6 and NiC o 2 Te O 6 , low-frequency spin excitations extremely sensitive to external magnetic field were observed. At least one of these magnons was simultaneously seen in Raman and THz spectra of both compounds, therefore we propose to assign them to electromagnons.

Item Type: Article
DOI/Identification number: 10.1103/PhysRevB.101.014429
Divisions: Faculties > Sciences > School of Physical Sciences
Depositing User: Emma McCabe
Date Deposited: 22 Jan 2020 09:42 UTC
Last Modified: 22 Jan 2020 09:43 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/79663 (The current URI for this page, for reference purposes)
McCabe, Emma E.: https://orcid.org/0000-0001-5868-4570
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