Lattice dynamics and spontaneous magnetodielectric effect in ilmenite CoTiO3

JOURNAL OF ALLOYS AND COMPOUNDS

卷:858

Article

Dubrovin, R. M.¹  Siverin, N., V¹  Prosnikov, M. A.^2,3  Chernyshev, V. A.⁴  Novikova, N. N.⁵  Christianen, P. C. M.^2,3  Balbashov, A. M.⁶  Pisarev, R., V¹ 

[1] Russian Acad Sci, Ioffe Inst, St Petersburg 194021, Russia

[2] Radboud Univ Nijmegen, High Field Magnet Lab HFML, EMFL, Toernooiveld 7, NL-6525 ED Nijmegen, Netherlands

[3] Radboud Univ Nijmegen, Inst Mol & Mat, Heyendaalseweg 135, NL-6525 AJ Nijmegen, Netherlands

[4] Ural Fed Univ, Dept Basic & Appl Phys, Ekaterinburg 620002, Russia

[5] Russian Acad Sci, Inst Spect, Troitsk 108840, Russia

[6] Moscow Power Engn Inst, Moscow 111250, Russia

关键词: CoTiO3;    Ilmenite;    Single crystals;    Lattice dynamics;    Infrared spectroscopy;    Raman spectroscopy;    Dielectric spectroscopy;    DFT calculations;   

DOI  :  10.1016/j.jallcom.2020.157633

来源: Elsevier

【 摘 要 】

Ilmenite-type crystals find a variety of technological applications due to their intriguing physical properties. We present the results of the lattice dynamics studies of honeycomb antiferromagnetic ilmenite CoTiO3 single crystal by the complementary polarized infrared, Raman, and dielectric spectroscopic techniques that are supplemented by the DFT calculations. The symmetries and frequencies of all predicted infrared- and Raman-active phonons were uniquely identified. Furthermore, it was found that the dielectric permittivity demonstrates distinct changes below antiferromagnetic ordering temperature in zero magnetic field due to the spontaneous magnetodielectric effect. Our results establish the solid basis for further investigations and more deep understanding of the coupling of phonons with spins and magnetic excitations, as well as their involvement in other physical phenomena in this promising material. (C) 2020 Elsevier B.V. All rights reserved.

【 授权许可】

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