Regensburg 2013 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 40: Poster Session Correlated Electrons
TT 40.15: Poster
Mittwoch, 13. März 2013, 15:00–19:00, Poster D
Spin-orbit-coupling-induced jeff states in perovskite iridates studied by photoemission spectroscopy — •Atsushi Yamasaki1,2, Ozan Kirilmaz2, Michael Sing2, Akira Sekiyama3,4, Masaaki Isobe5, Shigemasa Suga3,4, and Ralph Claessen2 — 1Konan University, Kobe, Japan — 2Universität Würzburg, Würzburg, Germany — 3Osaka University, Osaka, Japan — 4RIKEN SPring-8 Center, Hyogo, Japan — 5National Institute for Materials Science, Tsukuba, Japan
Novel physics induced by strong spin-orbit coupling has attracted lots of attention from both theory and experiment in recent years. Sr2IrO4 has a canted antiferromagnetic insulating state which seems to be driven by the strong spin-orbit coupling and relatively weak Coulomb interaction. The electronic structure near the Fermi level is characterized by jeff=1/2 states which have a partially quenched, but still finite angular momentum due to the spin-orbit coupling effect in the Oh crystal field. In order to provide deeper insight into these induced states, we have carried out high energy-resolution photoemission spectroscopy with hν=8.4-8000 eV photons on perovskite iridates. Photoemission spectroscopy in a wide range of excitation energies enables us to identify the bulk and surface electronic structure including their origin in the valence band. Hard-x-ray photoemission spectroscopy reveals genuine bulk jeff states due to the large photoionization cross section of the Ir 5d-orbitals and the large photoelectron mean-free path. Our results are compared with LDA+DMFT calculations.