Fermi surface and pseudogap in highly doped Sr2IrO4

The fate of the Fermi surface in bulk electron-doped Sr2IrO4 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 Sr2−xLaxIrO4 up to x = 0.2, a factor of two...

Full description

Bibliographic Details
Authors: Alexanian, Y., Torre, A. de la, Walker, S. McKeown, Straub, M., Gatti, G., Hunter, A., Mandloi, S., Cappelli, E., Riccò, S., Bruno, Flavio Yair, Radovic, M., Plumb, N. C., Shi, M., Osiecki, J., Polley, C., Kim, T. K., Dudin, P., Hoesch, M., Perry, R. S., Tamai, A., Baumberger, F.
Format: article
Publication Date:2025
Country:España
Institution:Universidad Complutense de Madrid (UCM)
Repository:Docta Complutense
Language:English
OAI Identifier:oai:docta.ucm.es:20.500.14352/124674
Online Access:https://hdl.handle.net/20.500.14352/124674
Access Level:Open access
Keyword:538.9
Pseudogap
Sr2IrO4
ARPES
Electronic structure
Física del estado sólido
Física de materiales
2211 Física del Estado Sólido
Description
Summary:The fate of the Fermi surface in bulk electron-doped Sr2IrO4 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 Sr2−xLaxIrO4 up to x = 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 + x recently observed above x* ≃ 0.161. 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 T* ≃ 200 K for x = 0.2, comparable to cuprates and to the energy scale of short range antiferromagnetic correlations in cuprates and iridates.

Similar Items