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The results of full study of X-ray photoelectron spectra (XPS) of spin-liquid candidate CuAl 2 O 4  including the measurements of high-energy resolved core level (Cu   $$2p$$  , Al   $$3p$$  , O   $$1s$$  ), Cu LMM Auger and valence band 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 CuAl 2 O 4 , where about 30% of Cu 2+  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 ma-terial.

Cu-Site Disorder in CuAl2O4 as Studied by XPS Spectroscopy