Soft x-ray irradiation induced metallization of layered TiNCl.
Noriyuki KataokaMasashi TanakaWataru HosodaTakumi TaniguchiShin-Ichi FujimoriTakanori WakitaYuji MuraokaTakayoshi YokoyaPublished in: Journal of physics. Condensed matter : an Institute of Physics journal (2020)
We have performed soft x-ray spectroscopy in order to study the photoirradiation time dependence of the valence band structure and chemical states of layered transition metal nitride chloride TiNCl. Under the soft x-ray irradiation, the intensities of the states near the Fermi level (EF) and the Ti3+component were increased, while the Cl 2pintensity was decreased. Ti 2p-3dresonance photoemission spectroscopy confirmed a distinctive Fermi edge with Ti 3dcharacter. These results indicate the photo-induced metallization originates from deintercalation due to Cl desorption, and thus provide a new carrier doping method that controls the conducting properties of TiNCl.