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

Ying Fu; Le Wang; Hu Cheng; Shenghai Pei; Xuefeng Zhou; Jian Chen; Shaoheng Wang; Ran Zhao; Wenrui Jiang; Cai Liu; Mingyuan Huang; XinWei Wang; Yusheng Zhao; Dapeng Yu; Fei Ye; Shanmin Wang; Jia-Wei Mei

paper

Core-level x-ray photoemission and Raman spectroscopy studies on electronic structures in Mott-Hubbard type nickelate oxide NdNiO $_{2}$

arXiv:1911.03177

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 $3 d$ and O $1 s$ XPS spectra, we conclude that NdNiO $_{2}$ has a large transfer energy. From the analysis of the main line of the Ni $2 p_{3/2}$ 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.

7 pages, 5 figures

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

Abstract

Core-level x-ray photoemission and Raman spectroscopy studies on electronic structures in Mott-Hubbard type nickelate oxide NdNiO $_{2}$