Soft X-ray irradiation induced metallization of layered TiNCl

Kataoka, Noriyuki*; Tanaka, Masashi*; Hosoda, Wataru*; Taniguchi, Takumi*; 藤森 伸一; Wakita, Takanori*; Muraoka, Yuji*; Yokoya, Takashi*

Journal of Physics; Condensed Matter, 33(3), p.035501_1 - 035501_6, 2021/01

https://doi.org/10.1088/1361-648X/abbbc3

We have performed soft X-ray spectroscopy in order to study thephotoirradiation time dependence of the valence band structure and chemicalstates of layered transition metal nitride chloride TiNCl. Under the soft X-ray irradiation, the intensities of the states near the Fermi level ()and the Ti component increased, while the Cl 2 intensity decreased. Ti2-3 resonance photoemission spectroscopy confirmed a distinctive Fermiedge with Ti 3 character. These results indicate the photo-inducedmetallization originates from deintercalation due to Cl desorption, and thusprovide a new carrier doping method that controls the conducting propertiesof TiNCl.