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Lattice dynamics of the infinite-layer nickelate LaNiO2

Shohei Hayashida1,2,*, Vignesh Sundaramurthy2, Wenfeng Wu3,4, Pascal Puphal2, Thomas Keller2,5, Björn Fåk6, Masahiko Isobe2, Bernhard Keimer2, Karsten Held7 et al.

Liang Si8,7,† and Matthias Hepting2,5,‡

  • *Contact author: s_hayashida@cross.or.jp
  • †Contact author: siliang@nwu.edu.cn
  • ‡Contact author: hepting@fkf.mpg.de
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Phys. Rev. B 112, 205104 – Published 3 November, 2025

DOI: https://doi.org/10.1103/rk6x-2f3r

Abstract

Infinite-layer (IL) nickelates have rapidly emerged as a new class of superconductors. However, due to the technical challenges of their topotactic synthesis, they have so far been realized primarily as thin films or polycrystalline powder samples, limiting comprehensive investigations of fundamental physical properties such as the lattice dynamics. Here, we present a time-of-flight inelastic neutron scattering study on a sample composed of a large number of coaligned bulk crystals of the IL nickelate LaNiO2. We observe several dispersive phonon branches, which are in good agreement with lattice dynamical calculations based on density-functional perturbation theory. In addition, we compare the characteristics of selected LaNiO2 phonon modes to those of isostructural cuprate superconductors. Our findings provide a reference point for future experimental and theoretical efforts aimed at understanding the interplay between lattice dynamics and electronic properties in IL nickelates.

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Phys. Rev. B 112, 205104– Published 3 November, 2025
  • Received 29 May 2025
  • Revised 3 September 2025
  • Accepted 8 October 2025
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