Journal
PHYSICAL REVIEW B
Volume 90, Issue 7, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.90.075142
Keywords
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Funding
- Air Force Office of Scientific Research [FA9550-11-1-0033, FA9550-12-1-0035]
- National Science Foundation through the MRSEC program [DMR-1120296]
- JSPS Postdoctoral Fellowships
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We employ molecular beam epitaxy to stabilize Ba2IrO4 thin films and utilize in situ angle-resolved photoemission spectroscopy to investigate the evolution of its electronic structure through the Neel temperature T-N. Our measurements indicate that dispersions of the relativistic J(eff) = 1/2 and 3/2 bands exhibit an unusual dichotomy in their behavior through the Neel transition. Although the charge gap survives into the paramagnetic state, only the J(eff) = 1/2 state exhibits a strong temperature dependence and its gap softens with increasing temperature approaching T-N, while the nearly fully occupied J(eff) = 3/2 state which remains nearby in energy exhibits negligible changes with temperature.
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