Emergence of low-energy electronic states in oxygen-controlled Mott insulator Ca${}_2$RuO${}_{4+\delta }$

Takeo Miyashita, Hideaki Iwasawa, Tomoki Yoshikawa +7

Insulator-to-metal transition in Ca${}_2$RuO${}_4$ has drawn keen attention because of its sensitivity to various stimulation and its potential controllability. Here, we report a d…