[17a-M_110-1~13] 3.4 Laser system and materials

11:30 AM - 11:45 AM JST(2:30 AM - 2:45 AM UTC)Presentation by Applicant for JSAP Young Scientists Presentation Award

[17a-M_110-10] Raman Spectroscopic Investigation of Ferroaxial Order in Na₂BaNi(PO₄)₂ Single Crystals

〇Ryunosuke Takahashi¹, Hayato Seno¹, Marin Takahashi¹, Shigetoshi Tomita¹, Reo Fukunaga¹, Suguru Nakata¹, Takayuki Nagai², Shigetada Yamagishi², Yoichi Kajita², Tsuyoshi Kimura², Masami Kanzaki³, Hiroki Wadati^1,4 (1.Univ. of Hyogo, 2.Univ. of Tokyo, 3.Okayama Univ., 4.ILE, Osaka Univ)

Keywords:

ferroaxial order,Raman spectroscopy,bulk single crystal

Ferroaxial order is a ferroic ordered state characterized by spontaneous rotational distortions, and has recently attracted significant attention following reports of optical switching of its domain states. Na₂BaNi(PO₄)₂ single crystals are among the few materials that realize a ferroaxial phase stable at room temperature, with a high transition temperature of 746 K. In this study, we investigated a comprehensive identification of phonon modes that are essential for exploring ferroaxial order by means of polarization-resolved Raman spectroscopy using both circularly and linearly polarized light. By combining the experimental results with first-principles calculations, we successfully identified phonon modes related to the rotational distortions associated with the ordering.