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Kim, B J; Jin, Hosub; Moon, S J; Kim, J-Y; Park, B-G; Leem, C S; Yu, Jaejun; Noh, T W; Kim, C; Oh, S-J; Park, J-H; Durairaj, V; Cao, G; Rotenberg, E
Physical review letters, 2008-Aug-15, 20080815, Letnik: 101, Številka: 7Journal Article
We investigated the electronic structure of 5d transition-metal oxide Sr2IrO4 using angle-resolved photoemission, optical conductivity, x-ray absorption measurements, and first-principles band calculations. The system was found to be well described by novel effective total angular momentum Jeff states, in which the relativistic spin-orbit coupling is fully taken into account under a large crystal field. Despite delocalized Ir 5d states, the Jeff states form such narrow bands that even a small correlation energy leads to the Jeff=1/2 Mott ground state with unique electronic and magnetic behaviors, suggesting a new class of Jeff quantum spin driven correlated-electron phenomena.
