Universal orbital and magnetic structures in infinite-layer nickelates (2312.16444v1)
Abstract: We conducted a comparative study of the rare-earth infinite-layer nickelates films, RNiO2 (R = La, Pr, and Nd) using resonant inelastic X-ray scattering (RIXS). We found that the gross features of the orbital configurations are essentially the same, with minor variations in the detailed hybridization. For low-energy excitations, we unambiguously confirm the presence of damped magnetic excitations in all three compounds. By fitting to a linear spin-wave theory, comparable spin exchange coupling strengths and damping coefficients are extracted, indicating a universal magnetic structure in the infinite-layer nickelates. Interestingly, while signatures of a charge order are observed in LaNiO2 in the quasi-elastic region of the RIXS spectrum, it is absent in NdNiO2 and PrNiO2. This prompts further investigation into the universality and the origins of charge order within the infinite-layer inickelates.
- V. I. Anisimov, D. Bukhvalov, and T. M. Rice, Electronic structure of possible nickelate analogs to the cuprates, Phys. Rev. B 59, 7901 (1999).
- K.-W. Lee and W. E. Pickett, Infinite-layer LaNiO2subscriptLaNiO2\mathrm{La}\mathrm{Ni}{\mathrm{O}}_{2}roman_LaNiO start_POSTSUBSCRIPT 2 end_POSTSUBSCRIPT: Ni1+superscriptNilimit-from1{\mathrm{Ni}}^{1+}roman_Ni start_POSTSUPERSCRIPT 1 + end_POSTSUPERSCRIPT is not Cu2+superscriptCulimit-from2{\mathrm{Cu}}^{2+}roman_Cu start_POSTSUPERSCRIPT 2 + end_POSTSUPERSCRIPT, Phys. Rev. B 70, 165109 (2004).
- A. S. Botana and M. R. Norman, Similarities and Differences between LaNiO2subscriptLaNiO2{\mathrm{LaNiO}}_{2}roman_LaNiO start_POSTSUBSCRIPT 2 end_POSTSUBSCRIPT and CaCuO2subscriptCaCuO2{\mathrm{CaCuO}}_{2}roman_CaCuO start_POSTSUBSCRIPT 2 end_POSTSUBSCRIPT and Implications for Superconductivity, Phys. Rev. X 10, 011024 (2020).
- J. Kapeghian and A. S. Botana, Electronic structure and magnetism in infinite-layer nickelates RNiO2𝑅subscriptNiO2R{\mathrm{NiO}}_{2}italic_R roman_NiO start_POSTSUBSCRIPT 2 end_POSTSUBSCRIPT (R=La−Lu𝑅LaLuR=\mathrm{La}\text{$-$}\mathrm{Lu}italic_R = roman_La - roman_Lu), Phys. Rev. B 102, 205130 (2020).
- F. Lechermann, Late transition metal oxides with infinite-layer structure: Nickelates versus cuprates, Phys. Rev. B 101, 081110 (2020).
- I. Leonov, S. L. Skornyakov, and S. Y. Savrasov, Lifshitz transition and frustration of magnetic moments in infinite-layer NdNiO2subscriptNdNiO2{\mathrm{NdNiO}}_{2}roman_NdNiO start_POSTSUBSCRIPT 2 end_POSTSUBSCRIPT upon hole doping, Phys. Rev. B 101, 241108 (2020).
- A. Subedi, Possible structural quantum criticality tuned by rare-earth ion substitution in infinite-layer nickelates, Phys. Rev. Mater. 7, 024801 (2023).
- See Supplemental Material at [URL] for additional experiment details, data and analysis.
- J. Lamsal and W. Montfrooij, Extracting paramagnon excitations from resonant inelastic x-ray scattering experiments, Phys. Rev. B 93, 214513 (2016).
- M. Hayward and M. Rosseinsky, Synthesis of the infinite layer Ni(I) phase NdNiO2+x2𝑥{}_{2+x}start_FLOATSUBSCRIPT 2 + italic_x end_FLOATSUBSCRIPT by low temperature reduction of NdNiO33{}_{3}start_FLOATSUBSCRIPT 3 end_FLOATSUBSCRIPT with sodium hydride, Solid State Sci. 5, 839 (2003).
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