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

Cai Liu; Dapeng Yu; Fei Ye; Hu Cheng; Jian Chen; Jia-Wei Mei; Le Wang; Mingyuan Huang; Ran Zhao; Shanmin Wang

arxiv: 1911.03177 · v2 · pith:WF5SNSCJnew · submitted 2019-11-08 · ❄️ cond-mat.supr-con · cond-mat.str-el

Core-level x-ray photoemission and Raman spectroscopy studies on electronic structures in Mott-Hubbard type nickelate oxide NdNiO₂

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-con cond-mat.str-el

keywords ndnioelectronicramancore-levelmott-hubbardnickelateoxidepeak

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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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