Lattice dynamics of the infinite-layer nickelate LaNiO$_2$
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arXiv
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| Main Authors: | , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866912689454841856 |
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| author | Hayashida, Shohei Sundaramurthy, Vignesh Wu, Wenfeng Puphal, Pascal Keller, Thomas Fåk, Björn Isobe, Masahiko Keimer, Bernhard Held, Karsten Si, Liang Hepting, Matthias |
| author_facet | Hayashida, Shohei Sundaramurthy, Vignesh Wu, Wenfeng Puphal, Pascal Keller, Thomas Fåk, Björn Isobe, Masahiko Keimer, Bernhard Held, Karsten Si, Liang Hepting, Matthias |
| contents | 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 co-aligned bulk crystals of the IL nickelate LaNiO$_2$. 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 LaNiO$_2$ 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. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2509_03750 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Lattice dynamics of the infinite-layer nickelate LaNiO$_2$ Hayashida, Shohei Sundaramurthy, Vignesh Wu, Wenfeng Puphal, Pascal Keller, Thomas Fåk, Björn Isobe, Masahiko Keimer, Bernhard Held, Karsten Si, Liang Hepting, Matthias Strongly Correlated Electrons Superconductivity 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 co-aligned bulk crystals of the IL nickelate LaNiO$_2$. 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 LaNiO$_2$ 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. |
| title | Lattice dynamics of the infinite-layer nickelate LaNiO$_2$ |
| topic | Strongly Correlated Electrons Superconductivity |
| url | https://arxiv.org/abs/2509.03750 |