2020年11月2日
Impact of the Lattice on Magnetic Properties and Possible Spin Nematicity in the S=1 Triangular Antiferromagnet NiGa2S4
Physical Review Letters
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- 巻
- 125
- 号
- 19
- 開始ページ
- 197201
- 終了ページ
- 記述言語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1103/PhysRevLett.125.197201
© 2020 American Physical Society. NiGa2S4 is a triangular lattice S=1 system with strong two dimensionality of the lattice, actively discussed as a candidate to host spin-nematic order brought about by strong quadrupole coupling. Using Raman scattering spectroscopy we identify a phonon of Eg symmetry which can modulate magnetic exchange J1 and produce quadrupole coupling. Additionally, our Raman scattering results demonstrate a loss of local inversion symmetry on cooling, which we associate with sulfur vacancies. This will lead to disordered Dzyaloshinskii-Moriya interactions, which can prevent long-range magnetic order. Using magnetic Raman scattering response we identify 160 K as a temperature of an upturn of magnetic correlations. The temperature range below 160 K, but above 50 K where antiferromagnetic correlations start to increase, is a candidate for spin-nematic regime.
- リンク情報
- ID情報
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- DOI : 10.1103/PhysRevLett.125.197201
- ISSN : 0031-9007
- eISSN : 1079-7114
- PubMed ID : 33216581
- SCOPUS ID : 85096094369