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Core-level x-ray photoemission and Raman spectroscopy studies on electronic structures in Mott-Hubbard type nickelate oxide NdNiO$_2$

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arxiv 1911.03177 v2 pith:WF5SNSCJ submitted 2019-11-08 cond-mat.supr-con cond-mat.str-el

Ying Fu , Le Wang , Hu Cheng , Shenghai Pei , Xuefeng Zhou , Jian Chen , Shaoheng Wang , Ran Zhao
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Wenrui Jiang Cai Liu Mingyuan Huang XinWei Wang Yusheng Zhao Dapeng Yu Fei Ye Shanmin Wang Jia-Wei Mei
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classification cond-mat.supr-concond-mat.str-el
keywords ndnioelectronicramancore-levelmott-hubbardnickelateoxidepeak
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abstract

We perform core-level X-ray photoemission spectroscopy (XPS) and electronic Raman scattering studies of electronic structures and spin fluctuations in the bulk samples of the nickelate oxide NdNiO$_2$. According to Nd $3d$ and O $1s$ XPS spectra, we conclude that NdNiO$_2$ has a large transfer energy. From the analysis of the main line of the Ni $2p_{3/2}$ XPS, we confirm the NiO$_2$ planes in NdNiO$_2$ are of Mott-Hubbard type in the Zaanen-Sawatzky-Allen scheme. The two-magnon peak in the Raman scattering provides direct evidence for the strong spin-fluctuation in NdNiO$_2$. The peak position determines the antiferromagnetic exchange $J=25$~meV. Our experimental results agree well with our previous theoretical results.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Origin of local magnetic exchange interaction in infiite-layer nickelates

    cond-mat.supr-con 2025-05 conditional novelty 7.0 of 10

    The conventional Ni-O sigma superexchange alone is too weak, and an interstitial s orbital pathway accounts for the missing magnetic exchange in infinite-layer nickelates.

  2. The critical nature of the Ni spin state in doped NdNiO$_2$

    cond-mat.supr-con 2019-09 conditional novelty 6.0 of 10

    An impurity exact-diagonalization model places NdNiO2's NiO2 layers at a singlet-triplet crossover, with a cuprate-like singlet hole state and superexchange about ten times smaller than in cuprates.

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