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Fermi surface and pseudogap in highly doped Sr2IrO4

Alexanian, Y. ; de la Torre, A. ; McKeown Walker, S. ; Straub, M. ; Gatti, G. ; Hunter, A. ; Mandloi, S. ; Cappelli, E. ; Riccò, S. and Bruno, F. Y. , et al. (2025) In npj Quantum Materials 10(1).
Abstract

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... (More)

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.

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publishing date
type
Contribution to journal
publication status
published
subject
in
npj Quantum Materials
volume
10
issue
1
article number
100
publisher
Nature Publishing Group
external identifiers
  • pmid:41049545
  • scopus:105018228131
ISSN
2397-4648
DOI
10.1038/s41535-025-00817-9
language
English
LU publication?
yes
id
051bdd21-98ef-45da-b571-5696ba696afd
date added to LUP
2025-11-20 14:50:38
date last changed
2025-11-21 03:00:06
@article{051bdd21-98ef-45da-b571-5696ba696afd,
  abstract     = {{<p>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−x</sub>La<sub>x</sub>IrO<sub>4</sub> 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* ≃ 0.16<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 T* ≃ 200 K for x = 0.2, comparable to cuprates and to the energy scale of short range antiferromagnetic correlations in cuprates and iridates.</p>}},
  author       = {{Alexanian, Y. and de la Torre, A. and McKeown Walker, S. and Straub, M. and Gatti, G. and Hunter, A. and Mandloi, S. and Cappelli, E. and Riccò, S. and Bruno, F. Y. and Radovic, M. and Plumb, N. C. and Shi, M. and Osiecki, J. and Polley, C. and Kim, T. K. and Dudin, P. and Hoesch, M. and Perry, R. S. and Tamai, A. and Baumberger, F.}},
  issn         = {{2397-4648}},
  language     = {{eng}},
  number       = {{1}},
  publisher    = {{Nature Publishing Group}},
  series       = {{npj Quantum Materials}},
  title        = {{Fermi surface and pseudogap in highly doped Sr<sub>2</sub>IrO<sub>4</sub>}},
  url          = {{http://dx.doi.org/10.1038/s41535-025-00817-9}},
  doi          = {{10.1038/s41535-025-00817-9}},
  volume       = {{10}},
  year         = {{2025}},
}