Novel J(eff)=1/2 Mott state induced by relativistic spin-orbit coupling in Sr2IrO4
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- Novel J(eff)=1/2 Mott state induced by relativistic spin-orbit coupling in Sr2IrO4
- Kim, BJ; Jin, Hosub; Moon, SJ; Kim, JY; Park, BG; Leem, CS; Yu, Jaejun; Noh, TW; Kim, C; Oh, SJ; Park, JH; Durairaj, V; Cao, G; Rotenberg, E
- WEAK FERROMAGNETISM; TRANSITION; SYSTEM; BA
- Issue Date
- AMER PHYSICAL SOC
- PHYSICAL REVIEW LETTERS, v.101, no.7, pp.076402 -
- 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.
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