Dresden 2017 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 21: Correlated Electrons: Frustrated Magnets - Strong Spin-Orbit Coupling 1
MA 21.6: 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 Jeff=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.