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| VOLUME 114 (2021) | ISSUE 9 | PAGE 627 |
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Cu-site disorder in CuAl2O4 as studied by XPS spectroscopy
I. S. Zhidkov+*, A. A. Belik×, A. I. Kukharenko+, S. O. Cholakh+, L. S. Taran*, A. Fujimori°, S. V. Streltsov*+, E. Z. Kurmaev*+
+Institute of Physics and Technology, Ural Federal University, 620002 Yekaterinburg, Russia *M. N. Mikheev Institute of Metal Physics of Ural Branch of Russian Academy of Sciences, 620108 Yekaterinburg, Russia ×International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science (NIMS), Namiki 1-1, Tsukuba, 305-0044, Ibaraki, Japan °Department of Applied Physics, Waseda University, Shinjuku-ku, 169-8555 Tokyo, Japan
Abstract
The results of full study of X-ray photoelectron spectra (XPS) of spin-liquid candidate CuAl2O4 including the measurements of high-energy resolved core level (Cu 2p, Al 3p, O 1s), Cu LMM Auger and valence band (VB) spectra are presented. The comparison of obtained results with spectra of reference samples and specially performed density functional theory calculations has confirmed a finite Cu site-disorder in CuAl2O4, where about 30 % of Cu2+ ions occupy the octahedral sites. Obtained valence band spectra can be used in further theoretical studies aimed on the investigation of electronic and magnetic properties of this mysterious material. |