Fermi surface and pseudogap in highly doped Sr2IrO4
The fate of the Fermi surface in bulk electron-doped Sr<sub>2</sub>IrO<sub>4</sub> remains elusive, as does the origin and extension of its pseudogap phase. Here, we use high-resolution angle-resolved photoelectron spectroscopy (ARPES) to investigate the electronic structure of Sr<sub>2-<i>x</i></sub> La <sub><i>x</i></sub> IrO<sub>4</sub> up to <i>x</i> = 0.2, a factor of two higher than in previous work. We find that the antinodal pseudogap persists up to the highest doping level, and thus beyond the sharp increase in Hall carrier density to ≃ 1 + <i>x</i> recently observed above <i>x</i>* ≃ 0.16<sup>1</sup>. This suggests that doped iridates host a unique phase of matter in which a large Hall density coexists with an anisotropic pseudogap, breaking up the Fermi surface into disconnected arcs. The temperature boundary of the pseudogap is <i>T</i>* ≃ 200 K for <i>x</i> = 0.2, comparable to cuprates and to the energy scale of short range antiferromagnetic correlations in cuprates and iridates.
Authors
- S. Riccò
- Jacek Osiecki (ORCID: https://orcid.org/0000-0003-0406-0310)
- Pavel Dudin (ORCID: https://orcid.org/0000-0002-5971-0395)
- F. Baumberger (ORCID: https://orcid.org/0000-0001-7104-7541)
- F. Y. Bruno (ORCID: https://orcid.org/0000-0002-3970-8837)
- E. Cappelli
- Abigail Hunter (ORCID: https://orcid.org/0000-0002-0443-4020)
- Craig Polley (ORCID: https://orcid.org/0000-0002-9893-2767)
- M. Shi (ORCID: https://orcid.org/0000-0002-6090-8219)
- A. Tamai (ORCID: https://orcid.org/0000-0001-5239-6826)
- M. Radović (ORCID: https://orcid.org/0000-0003-4042-9648)
- Y. Alexanian (ORCID: https://orcid.org/0000-0002-2626-400X)
- Moritz Hoesch (ORCID: https://orcid.org/0000-0002-0114-2110)
- Robin Perry (ORCID: https://orcid.org/0000-0002-1825-2201)
- N. C. Plumb (ORCID: https://orcid.org/0000-0002-2334-8494)
- A. de la Torre (ORCID: https://orcid.org/0000-0002-6751-8205)
- G. Gatti (ORCID: https://orcid.org/0000-0002-2048-1791)
- T. K. Kim (ORCID: https://orcid.org/0000-0003-4201-4462)
- M. Straub (ORCID: https://orcid.org/0000-0002-4698-0150)
- S. Mandloi (ORCID: https://orcid.org/0009-0006-9254-3636)
- S. McKeown Walker
Institutions
- University of Geneva (CH)
- Universidad Complutense de Madrid (ES)
- Rutherford Appleton Laboratory (GB)
- Northeastern University (US)
- Lund University (SE)
- Synchrotron soleil (FR)
- London Centre for Nanotechnology (GB)
- Deutsches Elektronen-Synchrotron DESY (DE)
- Paul Scherrer Institute (CH)
- Diamond Light Source (GB)
- MAX IV Laboratory (SE)
- Eastern University (BD)
- Swiss Light Source
- University College London (GB)
- Zhejiang University (CN)
Publication Details
- Journal
- npj Quantum Materials
- Published
- 2025-10-03
- DOI
- https://doi.org/10.1038/s41535-025-00817-9
- Primary Topic
- Advanced Condensed Matter Physics
- Type
- article
- Field-Weighted Citation Impact
- 0.00
Funders
- National Science Foundation
- Diamond Light Source
- Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung
- VINNOVA
- Svenska Forskningsrådet Formas
- Paul Scherrer Institut
- Vetenskapsrådet