Doping induced Mott collapse and possible density wave instabilities in (Sr1−xLax)3Ir2O7
| Autor: | Zhenyu Wang, Daniel Walkup, Tom Hogan, Stephen D. Wilson, Yulia Maximenko, Wenwen Zhou, Vidya Madhavan, Ziqiang Wang |
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| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Physics
Condensed Matter::Quantum Gases High-temperature superconductivity Condensed matter physics Doping Fermi energy Condensed Matter Physics lcsh:Atomic physics. Constitution and properties of matter Electronic Optical and Magnetic Materials law.invention Mott transition lcsh:QC170-197 Condensed Matter::Materials Science law Condensed Matter::Superconductivity lcsh:TA401-492 Cuprate Condensed Matter::Strongly Correlated Electrons lcsh:Materials of engineering and construction. Mechanics of materials Scanning tunneling microscope Cooper pair Perovskite (structure) |
| Zdroj: | npj Quantum Materials, Vol 4, Iss 1, Pp 1-7 (2019) |
| ISSN: | 2397-4648 |
| DOI: | 10.1038/s41535-019-0183-y |
| Popis: | The path from a Mott insulating phase to high temperature superconductivity encounters a rich set of unconventional phenomena involving the insulator-to-metal transition (IMT), such as emergent electronic orders and pseudogaps, that ultimately affect the condensation of Cooper pairs. A huge hindrance to understanding the origin of these phenomena is the difficulty in accessing doping levels near the parent state. The Jeff = 1/2 Mott state of the perovskite strontium iridates has revealed intriguing parallels to the cuprates, with the advantage that it provides unique access to the Mott transition. Here, we exploit this accessibility to study the IMT and the possible nearby electronic orders in the electron-doped bilayer iridate (Sr1 − xLax)3Ir2O7. Using spectroscopic imaging scanning tunneling microscopy, we image the La dopants in the top as well as the interlayer SrO planes. Surprisingly, we find a disproportionate distribution of La between these layers with the interlayer La being primarily responsible for the IMT. This reveals the distinct site-dependent effects of dopants on the electronic properties of bilayer systems. Electron doping also results in charge reordering. We find unidirectional electronic order concomitant with the structural distortion known to exist in this system. Intriguingly, similar to the single layer iridate, we also find local resonant states forming a checkerboard-like pattern trapped by La. This suggests that multiple charge orders may exist simultaneously in Mott systems, even with only one band crossing the Fermi energy. |
| Databáze: | OpenAIRE |
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