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<p>Optical spectroscopy is a non-destructive and non-contact method used to explore the physical properties of solids over a wide range of energy, and it is particularly suitable for studying two-dimensional van der Waals magnetic materials due to its ability to probe magnetic order and electronic transitions simultaneously. We have investigated the optical properties of the layered antiferromagnet NiGa<sub>2</sub>S<sub>4</sub> over a wide range of frequencies from the near-infrared region to the visible region, obtaining valuable insights into the electronic structure of NiGa<sub>2</sub>S<sub>4</sub>. NiGa<sub>2</sub>S<sub>4</sub> is an insulator with a triangular antiferromagnetic spin configuration (S = 1) and is known as a spin-nematic material. We identified a <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="40042_2025_1444_Article_IEq1.gif" Format="GIF" Height="15" Rendition="HTML" Resolution="72" Type="Linedraw" Width="43" /> </InlineMediaObject> <EquationSource Format="TEX">\(d-d\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>d</mi> <mo>-</mo> <mi>d</mi> </mrow> </math></EquationSource> </InlineEquation> transition and an absorption edge in the near-infrared and visible regions and studied their temperature dependence. In particular, we observed that the temperature dependence of the <InlineEquation ID="IEq2"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="40042_2025_1444_Article_IEq1.gif" Format="GIF" Height="15" Rendition="HTML" Resolution="72" Type="Linedraw" Width="43" /> </InlineMediaObject> <EquationSource Format="TEX">\(d-d\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>d</mi> <mo>-</mo> <mi>d</mi> </mrow> </math></EquationSource> </InlineEquation> transition exhibits a distinct change in its trend at the spin-nematic phase transition temperature. These findings suggest key insights into the electronic transitions and magnetic properties of NiGa<sub>2</sub>S<sub>4</sub>. Our optical spectroscopic investigation of NiGa<sub>2</sub>S<sub>4</sub> enhances our understanding of its complex electronic structure, contributing to the broader field of condensed matter physics and materials science.</p>

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Temperature-dependent optical properties of van der Waals antiferromagnet NiGa2S4

  • 期刊论文

  • 发表日期：

    2025年8月6日

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  • Jonghyeon Kim,
  • Junghyun Kim,
  • Je-Geun Park,
  • Jae Hoon Kim

摘要

Optical spectroscopy is a non-destructive and non-contact method used to explore the physical properties of solids over a wide range of energy, and it is particularly suitable for studying two-dimensional van der Waals magnetic materials due to its ability to probe magnetic order and electronic transitions simultaneously. We have investigated the optical properties of the layered antiferromagnet NiGa2S4 over a wide range of frequencies from the near-infrared region to the visible region, obtaining valuable insights into the electronic structure of NiGa2S4. NiGa2S4 is an insulator with a triangular antiferromagnetic spin configuration (S = 1) and is known as a spin-nematic material. We identified a \(d-d\) d - d transition and an absorption edge in the near-infrared and visible regions and studied their temperature dependence. In particular, we observed that the temperature dependence of the \(d-d\) d - d transition exhibits a distinct change in its trend at the spin-nematic phase transition temperature. These findings suggest key insights into the electronic transitions and magnetic properties of NiGa2S4. Our optical spectroscopic investigation of NiGa2S4 enhances our understanding of its complex electronic structure, contributing to the broader field of condensed matter physics and materials science.