Temperature-dependent photoemission studies of the electronic states of CuBr

Photoemission spectra of CuBr are found to be unusually temperature dependent, which is attributed to the modulation of hybridization between Cu $d$ orbitals and Br $p$ orbitals. The density of states deduced shows two separate parts of valence states with a 1-eV gap in between. Atomic origins of structures in the deduced valence-band density of states have also been assigned.