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<p>In the monoclinic polytype NbS<sub>3</sub>-II, the monoclinic <b>b</b>-axis of which coincides with the direction of greatest conductivity, two charge density waves (CDWs) have been observed at room temperature: CDW-0 with the wave vector <b>q</b><sub>0</sub> = 0.5<b>a</b>* + 0.352<b>b</b>* + 0.5<b>c</b>* and CDW-1 with the wave vector <b>q</b><sub>1</sub> = 0.5<b>a</b>* + 0.298<b>b</b>* + 0.5<b>c</b>*. X‑ray diffraction patterns obtained in the temperature range of 90–500 K have shown that the vectors <b>q</b><sub>0</sub> and <b>q</b><sub>1</sub> depend on the temperature, but their <b>b</b>* coordinates satisfy the relation <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11448_2025_4176_Article_IEq1.gif" Format="GIF" Height="21" Rendition="HTML" Resolution="72" Type="Linedraw" Width="211" /> </InlineMediaObject> <EquationSource Format="TEX">\(2q_{0}^{{{\mathbf{b}}\text{*}}}(T) + q_{1}^{{{\mathbf{b}}\text{*}}}(T) = {\text{const}} = 1\)</EquationSource> <!--JETPLet2560015Pokrovskii-m1--> </InlineEquation>. It has been concluded that the wave vector <b>q</b><sub>1</sub> of CDW-1 is determined not only by the nesting of Fermi surfaces, but also by the vector <b>q</b><sub>0</sub>, because CDW-1 is adjusted to the second harmonic of CDW-0, which indicates the interaction between charge density waves. This conclusion has been confirmed by structural studies of NbS<sub>3</sub>-II samples, the lattice of which is strongly deformed due to a high concentration of twins. In these samples, CDW-0 is conserved, and the wave vector of CDW-1 has the <b>b</b>* component not related to <b>q</b><sub>0</sub>.</p>

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Interaction between Charge Density Waves in the Monoclinic Phase of NbS3

  • 期刊论文

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  • 发表日期：

    2025年3月1日

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  • V. Ya. Pokrovskii,
  • A. L. Vasiliev,
  • N. B. Bolotina,
  • A. G. Ivanova,
  • S. V. Zaitsev-Zotov,
  • S. G. Zybtsev,
  • A. A. Sinchenko

摘要

In the monoclinic polytype NbS3-II, the monoclinic b-axis of which coincides with the direction of greatest conductivity, two charge density waves (CDWs) have been observed at room temperature: CDW-0 with the wave vector q0 = 0.5a* + 0.352b* + 0.5c* and CDW-1 with the wave vector q1 = 0.5a* + 0.298b* + 0.5c*. X‑ray diffraction patterns obtained in the temperature range of 90–500 K have shown that the vectors q0 and q1 depend on the temperature, but their b* coordinates satisfy the relation \(2q_{0}^{{{\mathbf{b}}\text{*}}}(T) + q_{1}^{{{\mathbf{b}}\text{*}}}(T) = {\text{const}} = 1\) . It has been concluded that the wave vector q1 of CDW-1 is determined not only by the nesting of Fermi surfaces, but also by the vector q0, because CDW-1 is adjusted to the second harmonic of CDW-0, which indicates the interaction between charge density waves. This conclusion has been confirmed by structural studies of NbS3-II samples, the lattice of which is strongly deformed due to a high concentration of twins. In these samples, CDW-0 is conserved, and the wave vector of CDW-1 has the b* component not related to q0.