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Description:

We investigate the electronic structure at the surface of the correlated oxide Ca3Ru2O7, a low-symmetry ruthenate oxide which hosts an unconventional polar-metal phase. From a combination of angle-resolved photoemission spectroscopy and scanning tunneling spectroscopy measurements, we demonstrate that the surface hosts an insulating phase, a distinct departure from metallicity within the bulk. Utilizing quantitative low-energy electron diffraction in conjunction with electronic structure calculations, we show how this results from a combined surface structure relaxation and the impact of marked electronic correlations in this system. Our findings highlight the proximity of Ca3Ru2O7 to an insulating metallic state, and illustrate how subtle structural distortions can control its emergent electronic phases.

Rights:

• http://arxiv.org/licenses/nonexclusive-distrib/1.0/
  

Keyword: Ca3Ru2P7, STM/STS

Date published: 2026-08-26

Publisher: American Physical Society (APS)

Journal:

• Physical Review Letters (ISSN: 00319007) vol. 137 issue. 9 096503

Funding:

• Leverhulme Trust RL-2016-006
• Leverhulme Trust RPG-2022-315
• Diamond Light Source
• International Max Planck Research School for Chemistry and Physics of Quantum Materials
• Vetenskapsrådet 2018-07152
• VINNOVA 2018-04969
• Svenska Forskningsrådet Formas 2019-02496
• Japan Society for the Promotion of Science 24K01461
• University of Edinburgh
• UK Research and Innovation
• Engineering and Physical Sciences Research Council

Manuscript type: Author's version (Submitted manuscript)

MDR DOI:

First published URL: https://doi.org/10.1103/x9gh-xxwb

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Updated at: 2026-08-27 08:47:50 +0900

Published on MDR: 2026-08-27 10:26:21 +0900