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X-ray Photoemission Spectroscopy Study of the Metal-Insulator Transition in Ni(S,Se)$_\text{2}$
New Phys.: Sae Mulli 2019; 69: 596~600
Published online June 28, 2019;
© 2019 New Physics: Sae Mulli.

Jinwon JEONG,Da-Hee JEONG, Han-Jin NOH*

Department of Physics, Chonnam National University, Gwangju 61186, Korea
Correspondence to:
Received April 22, 2019; Revised May 14, 2019; Accepted May 21, 2019.
cc This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License ( which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
The electronic structure of pyrite NiS$_{2-x}$Se$_x$ has been studied for various Se compositions (x) by using X-ray photoemission spectroscopy (XPS). The Ni 2$p$ XPS spectra show a weak dependence on $x$ in the spectral weight ratio of the satellite to the main peak and in the main-to-satellite peak distance, but they show a noticeable difference in the asymmetry of the 2$p_{3/2}$ main peaks. This result indicates that the key electronic structure parameters hardly vary across the metal-insulator transition, but that the screening strengths of the conduction electrons do change much. This apparent contradiction can be reconciled with the percolation scenario proposed in our previous X-ray absorption study.
PACS numbers: 71.30.+h, 72.80.Ga, 79.60.-i
Keywords: Metal-insulator transition, Conductivity, X-ray photoemission spectroscopy, Percolation

June 2019, 69 (6)
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