Dresden 2014 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 79: Correlated Electrons - Poster Session

TT 79.58: Poster

Mittwoch, 2. April 2014, 15:00–19:00, P2

Electronic structure of Sr₂IrO₄ polycrystals and PLD grown thin films — •Ozan Kirilmaz¹, Atsushi Yamasaki², Michael Sing¹, Akira Sekiyama^3,4, Masaaki Isobe⁵, Shigemasa Suga^3,4, and Ralph Claessen¹ — ¹Physikalisches Institut and Röntgen Center for Complex Materials Systems (RCCM), Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany — ²Faculty of Science and Engineering, Konan University, Kobe 658-8501, Japan — ³Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan — ⁴RIKEN SPring-8 Center, Sayo, Hyogo 679-5148, Japan — ⁵National Institute for Materials Science, Tsukuba, Ibaraki 305-0044, Japan

Novel physics induced by strong spin-orbit coupling has attracted strong attention from both theory and experiment in recent years. Sr₂IrO₄ has an insulating ground state which seems to be driven by the strong spin-orbit coupling and relatively weak Coulomb interaction. The electronic structure near the Fermi level in Sr₂IrO₄ is characterized by J_eff=1/2 states. In order to provide deeper insight into these states, we have carried out high energy-resolution photoemission spectroscopy on both polycrystalline and thin film 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.