Core-level x-ray photoemission and Raman spectroscopy studies on electronic structures in Mott-Hubbard type nickelate oxide NdNiO2
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 NdNiO2. According to Nd 3d and O 1s XPS spectra, we conclude that NdNiO2 has a large transfer energy. From the analysis of the main line of the Ni 2p3/2 XPS, we confirm the NiO2 planes in NdNiO2 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 NdNiO2. The peak position determines the antiferromagnetic exchange J=25~meV. Our experimental results agree well with our previous theoretical results.
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