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arXiv 2608.29994cond-mat.mtrl-sci

氮化镥声子色散L面的范霍夫奇点

Van Hove singularities at the $L$-face of the lutetium nitride phonon dispersion

M. Markwitz, K. Kneisel, R. G. Buckley, K. C. Rule, M. Chegeni, H. J. Trodahl, W. F. Holmes-Hewett, J. D. Miller, F. Natali, M. Maddah, B. J. Ruck, S. Granville

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中文总结 AI 辅助

研究通过中子散射与DFT+U计算,发现LuN声子色散L面的范霍夫奇点,深化了对镧系氮化物声子动力学的认识。

中文摘要 AI 辅助

我们在4 K下利用弹性和非弹性中子散射数据,报道了镧系氮化物(LnN)中典型的4f填满非磁性成员氮化镥(LuN)的结构与振动性质。我们发现广义态密度存在一个峰,结合DFT+U计算的输入,将其归因于布里渊区四重简并L面上的范霍夫奇点。本研究推进了对LnN声子动力学的理解,超出了Γ点的范畴。

英文摘要

We report the structural and vibrational properties of the prototypical 4$f$-filled nonmagnetic member LuN of the lanthanide nitrides, \textit{Ln}N, with elastic and inelastic neutron scattering data at $4$~K. We find a peak in the generalized density of states which, through input from a DFT+$U$ computation, we ascribe to a van Hove singularity on the fourfold-degenerate $L$-face of the Brillouin zone. This work advances the understanding of phonon dynamics in \textit{Ln}N beyond the $Γ$-point.

发表机构

  • Victoria University of Wellington(惠灵顿维多利亚大学)
  • Robinson Research Institute, Victoria University of Wellington(惠灵顿维多利亚大学罗宾逊研究所)
  • The MacDiarmid Institute for Advanced Materials and Nanotechnology, Victoria University of Wellington(惠灵顿维多利亚大学麦克迪亚米德先进材料与纳米技术研究所)
  • School of Chemical and Physical Sciences, Victoria University of Wellington(惠灵顿维多利亚大学化学与物理科学学院)
  • University of Wollongong(伍伦贡大学)
  • School of Physics, Faculty of Engineering and Information Science, University of Wollongong(伍伦贡大学工程与信息科学学院物理系)
  • Australian Centre for Neutron Scattering, Australian Nuclear Science and Technology Organisation(澳大利亚核科学与技术组织中子散射中心)

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