Engineering of octahedral rotations and electronic structure in ultrathin SrIrO3 films
| Autor: | Yuefeng Nie, Jian Zhou, Xiaoqing Pan, Wanlin Guo, Dianxiang Ji, Zhong-ming Gu |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Superconductivity
Physics Condensed matter physics Photoemission spectroscopy 02 engineering and technology Electronic structure 021001 nanoscience & nanotechnology 01 natural sciences Condensed Matter::Materials Science Octahedron Condensed Matter::Superconductivity 0103 physical sciences Antiferromagnetism Condensed Matter::Strongly Correlated Electrons Cuprate 010306 general physics 0210 nano-technology Ground state Perovskite (structure) |
| Zdroj: | Physical Review B. 101 |
| ISSN: | 2469-9969 2469-9950 |
| Popis: | Layered perovskite iridate ${\mathrm{Sr}}_{2}{\mathrm{IrO}}_{4}$ shares many similarities with high ${T}_{\text{c}}$ cuprates and is expected to host novel superconductivity but has never been realized experimentally. Despite the similarities, the prominent ${\mathrm{IrO}}_{6}$ octahedral rotations and sizable net canted antiferromagnetic moments lying in each ${\mathrm{IrO}}_{2}$ plane in ${\mathrm{Sr}}_{2}{\mathrm{IrO}}_{4}$ are strikingly different from high ${T}_{\text{c}}$ cuprates where the octahedral rotations and net canted moment are much smaller or negligible. Here, using reactive molecular beam epitaxy, we demonstrate that the octahedral rotations around the in-plane and out-of-plane axes in epitaxial iridate films can be suppressed step-by-step via interfacial clamping imposed by cubic substrates as the films approach the two-dimensional limit. In situ angle-resolved photoemission spectroscopy and first-principles calculations show a gapped antiferromagnetic ground state with dispersive low-lying bands in 1- and 2-unit-cell-thick ${\mathrm{SrIrO}}_{3}$ films, providing ideal single- and bilayer analogies of high ${T}_{\text{c}}$ cuprates. |
| Databáze: | OpenAIRE |
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