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Publisher Correction: Evolution of electronic and magnetic properties of Sr2IrO4 under strain

2022, Pärschke, Ekaterina M., Chen, Wei-Chih, Ray, Rajyavardhan, Chen, Cheng-Chien

In the original version of this Article, all the figures (together with the captions) are inadvertently misplaced. Figures 1, 2, 3, 4, 5, 6 and 7 were wrongly placed in the positions of Figures 7, 1, 2, 3, 4, 5 and 6, respectively. This has been corrected in both the PDF and HTML versions of the Article.

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Evidence for a percolative Mott insulator-metal transition in doped Sr2IrO4

2021, Sun, Zhixiang, Guevara, Jose M., Sykora, Steffen, Pärschke, Ekaterina M., Manna, Kaustuv, Maljuk, Andrey, Wurmehl, Sabine, van den Brink, Jeroen, Büchner, Bernd, Hess, Christian

Despite many efforts to rationalize the strongly correlated electronic ground states in doped Mott insulators, the nature of the doping-induced insulator-to-metal transition is still a subject under intensive investigation. Here, we probe the nanoscale electronic structure of the Mott insulator Sr2IrO4−δ with low-temperature scanning tunneling microscopy and find an enhanced local density of states (LDOS) inside the Mott gap at the location of individual defects which we interpret as defects at apical oxygen sites. A chiral behavior in the topography for those defects has been observed. We also visualize the local enhanced conductance arising from the overlapping of defect states which induces finite LDOS inside of the Mott gap. By combining these findings with the typical spatial extension of isolated defects of about 2 nm, our results indicate that the insulator-to-metal transition in Sr2IrO4−δ could be percolative in nature.