Structural, magnetic, and spin dynamical properties of the polar antiferromagnets Ni.sub.3-x./sub.Co.sub.x./sub.TeO.sub.6./sub. (x=1, 2)

0531758 - FZÚ 2021 RIV US eng J - Článek v odborném periodiku
Skiadopoulou, Styliani - Retuerto, M. - Borodavka, Fedir - Kadlec, Christelle - Kadlec, Filip - Míšek, Martin - Prokleška, J. - Deng, Z. - Tan, X. - Frank, C. - Alonso, J.A. - Fernandez-Diaz, M.T. - Croft, M. - Orlandi, F. - Manuel, P. - McCabe, E. - Legut, D. - Greenblatt, M. - Kamba, Stanislav
Structural, magnetic, and spin dynamical properties of the polar antiferromagnets Ni_3-xCo_xTeO₆ (x=1, 2).
Physical Review B. Roč. 101, č. 1 (2020), s. 1-10, č. článku 014429. ISSN 2469-9950. E-ISSN 2469-9969
Grant CEP: GA MŠMT(CZ) EF16_019/0000760; GA ČR GA18-09265S; GA MŠMT(CZ) LM2018096
Grant ostatní: OP VVV - SOLID21(XE) CZ.02.1.01/0.0/0.0/16_019/0000760
Institucionální podpora: RVO:68378271
Klíčová slova: antiferromagnetism * magnons * phonons * crystal growth * neutron diffraction * IR and Raman spectroscopy * THz spectroscopy * X-ray diffraction
Obor OECD: Condensed matter physics (including formerly solid state physics, supercond.)
Impakt faktor: 4.036, rok: 2020
Způsob publikování: Omezený přístup
https://doi.org/10.1103/PhysRevB.101.014429

We present results of a multimethod investigation of the polar antiferromagnets Ni2CoTeO6 and NiCo2TeO6. Both compounds present an incommensurate antiferromagnetic helical structure with spins lying in the ab plane, in contrast to the collinear one along the c axis in Ni3TeO6. 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 TN, in both Ni2CoTeO6 and NiCo2TeO6, 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.

Trvalý link: http://hdl.handle.net/11104/0310371