Spectroscopic signature of trimer Mott insulator and charge disproportionation in BaIrO${}_3$

R. Okazaki, S. Ito, K. Tanabe +4

We have measured the reflectivity spectra of the barium iridate $9R$ BaIrO${}_3$, the crystal structure of which consists of characteristic Ir${}_3$O${}_{12}$ trimers. In the high-temper…