Dresden 2017 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 56: Poster Session: Low-Dimensional Systems

TT 56.14: Poster

Mittwoch, 22. März 2017, 15:00–19:00, P2-OG4

Probing the dimensionality-driven metal-insulator transition in spin-orbit coupled SrIrO₃ thin films — •Philipp Schütz¹, Lenart Dudy¹, Judith Gabel¹, Martin Stübinger¹, Marius-Adrian Husanu², Vladimir Strocov², Michael Sing¹, and Ralph Claessen¹ — ¹Physikalisches Institut and Röntgen Center for Complex Material Systems (RCCM), Universität Würzburg, Germany — ²Swiss Light Source, Paul Scherrer Institut, Villigen, Switzerland

Although typically viewed to be disparate properties, the large spin-orbit-coupling (SOC) and relatively weak electronic correlations are roughly of the same order of magnitude in iridate compounds. The prototypical Ruddlesden-Popper iridates Sr_n+1Ir_nO_3n+1 have attracted special attention since they exhibit a SOC-induced Mott transition dependent on the value of n. Whereas the quasi-two-dimensional compound Sr₂IrO₄ (n=1) shows a Mott-like insulating state, its three-dimensional analogue SrIrO₃ (n=∞) is a correlated metal in proximity to a metal-insulator-transition. As an alternative to single crystal growth of Ruddlesden-Popper-iridates with different n, we investigate the effect of dimensionality through synthesis of atomically thin SrIrO₃ films by pulsed laser deposition, which analogously exhibit a metal-insulator-transition as function of thickness. We present a systematic investigation of the k-resolved electronic structure near the metal-insulator-transition by means of synchrotron-based soft x-ray angular-resolved photoemission spectroscopy (SX-ARPES), which sheds light on the intricate interplay between spin-orbit coupling, electronic correlations and dimensionality.