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Stella Skiadopoulou; Maria Retuerto; Fedir Borodavka; Christelle Kadlec; Filip Kadlec; Martin Míšek; Jan Prokleška; Zheng Deng; Xiaoyan Tan; Corey Frank; Jose A. Alonso; Maria Tereza Fernandez-Diaz; Mark Croft; Fabio Orlandi; Pascal Manuel; Emma McCabe; Dominik Legut; Martha Greenblatt; Stanislav Kamba

doi:10.1103/PhysRevB.101.014429

Structural, magnetic, and spin dynamical properties of the polar antiferromagnets $N i_{3 - x} C o_{x} Te O_{6} (x = 1, 2)$

Stella Skiadopoulou ^1,2,3,*, Maria Retuerto⁴, Fedir Borodavka ¹, Christelle Kadlec¹, Filip Kadlec ¹, Martin Míšek¹, Jan Prokleška⁵, Zheng Deng⁴, Xiaoyan Tan^4,† et al.

Corey Frank ⁴, Jose A. Alonso ⁶, Maria Tereza Fernandez-Diaz⁷, Mark Croft⁸, Fabio Orlandi⁹, Pascal Manuel⁹, Emma McCabe ¹⁰, Dominik Legut², Martha Greenblatt⁴, and Stanislav Kamba ¹

¹Institute of Physics,Czech Academy of Sciences, Na Slovance 2, 18221 Prague 8, Czech Republic
²IT4Innovations, VSB Technical University of Ostrava, 17, Listopadu 2172/15, CZ-708 00 Ostrava-Poruba, Czech Republic
³School of Physics, CRANN, Trinity College, Dublin 2, Ireland
⁴Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, 610 Taylor Road, Piscataway, New Jersey 08854, USA
⁵Department of Condensed Matter Physics, Faculty of Mathematics and Physics, Charles University, Ke Karlovu 5, 121 16 Prague 2, Czech Republic
⁶Instituto de Ciencia de Materiales de Madrid, C.S.I.C., Cantoblanco, E-28049 Madrid, Spain
⁷Institut Laue Langevin, BP 156X, Grenoble, F-38042, France
⁸Department of Physics and Astronomy, Rutgers, the State University of New Jersey, 136 Frelinghusen Road, Piscataway, New Jersey 08854, USA
⁹ISIS Facility, STFC, Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire, OX11 0QX, United Kingdom
¹⁰School of Physical Sciences, University of Kent, Canterbury, Kent, CT2 7NH, United Kingdom

^*Corresponding author: skiadops@tcd.ie
^†Present address: Department of Chemistry and Biochemistry, George Mason University, 4400 University Dr, Fairfax, Virginia 22030, USA.

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Phys. Rev. B 101, 014429 – Published 21 January, 2020

DOI: 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.

Physical Review B

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Structural, magnetic, and spin dynamical properties of the polar antiferromagnets $N i_{3 - x} C o_{x} Te O_{6} (x = 1, 2)$

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

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Structural, magnetic, and spin dynamical properties of the polar antiferromagnets $N i_{3 - x} C o_{x} Te O_{6} (x = 1, 2)$