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

Sun, Z., Guevara, J. M., Sykora, S., Pärschke, E. M., Manna, K., Maljuk, A., et al. (2021). Evidence for a percolative Mott insulator-metal transition in doped Sr2IrO4. Physical Review Research, 3(2): 023075, pp. 1-9. doi:10.1103/PhysRevResearch.3.023075.

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Sun, Zhixiang1, Author
Guevara, Jose M.1, Author
Sykora, Steffen1, Author
Pärschke, Ekaterina M.1, Author
Manna, Kaustuv2, Author              
Maljuk, Andrey1, Author
Wurmehl, Sabine1, Author
Van Den Brink, Jeroen1, Author
Büchner, Bernd1, Author
Hess, Christian1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863425              

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 Abstract: 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. © 2021 authors. Published by the American Physical Society.

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Language(s): eng - English
 Dates: 2021-04-272021-04-27
 Publication Status: Published in print
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 Rev. Type: -
 Identifiers: DOI: 10.1103/PhysRevResearch.3.023075
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Title: Physical Review Research
Source Genre: Journal
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Publ. Info: College Park, Maryland, United States : American Physical Society (APS)
Pages: - Volume / Issue: 3 (2) Sequence Number: 023075 Start / End Page: 1 - 9 Identifier: ISSN: 2643-1564
CoNE: https://pure.mpg.de/cone/journals/resource/2643-1564