Dresden 2017 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 25: Correlated Electrons: Frustrated Magnets - Strong Spin-Orbit Coupling 1

TT 25.6: Vortrag

Dienstag, 21. März 2017, 10:45–11:00, HSZ 304

Electronic structure of Sr₂IrO₄ probed with low temperature scanning tunneling microscopy — Zhixiang Sun, •Jose M. Guevara, Danny Baumann, Kaustuv Manna, Sabine Wurmehl, Bernd Büchner, and Christian Hess — IFW-Dresden, Helmholtzstrasse 20, 01069

Sr₂IrO₄ is the main example of a spin-orbit assisted Mott insulator. In the family of iridates, Sr₂IrO₄ has also been postulated as a candidate to emulate the physics of the parent compound of the high-temperature superconductors cuprates, where the doping effect in the insulator to metal transition is still not well understood.

In this work, we classify different predominant defects in Sr₂IrO₄, with low temperature STM/S. We probe the spatial structure symmetry of these defects. From the tunneling spectra, we identify the energy of the upper and lower J_eff=1/2 Hubbard bands, the Mott gap, and the variation of the electronic structure due to defects. A charge transfer-like behavior for the defect caused ingap states is observed.

Our measurements provide detailed results about the defect effects to the electronic properties of Sr₂IrO₄, which can be important for further understanding of the doping effect in iridates and the insulator to metal transition in Mott insulators.