Hsu, Y-T;
Prishchenko, D;
Berben, M;
Culo, M;
Wiedmann, S;
Hunter, EC;
Tinnemans, P;
... Perry, RS; + view all
(2021)
Evidence for strong electron correlations in a nonsymmorphic Dirac semimetal.
npj Quantum Materials
, 6
(1)
, Article 92. 10.1038/s41535-021-00396-5.
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Abstract
Metallic iridium oxides (iridates) provide a fertile playground to explore new phenomena resulting from the interplay between topological protection, spin-orbit and electron-electron interactions. To date, however, few studies of the low energy electronic excitations exist due to the difficulty in synthesising crystals with sufficiently large carrier mean-free-paths. Here, we report the observation of Shubnikov-de Haas quantum oscillations in high-quality single crystals of monoclinic SrIrO3 in magnetic fields up to 35 T. Analysis of the oscillations reveals a Fermi surface comprising multiple small pockets with effective masses up to 4.5 times larger than the calculated band mass. Ab-initio calculations reveal robust linear band-crossings at the Brillouin zone boundary, due to its non-symmorphic symmetry, and overall we find good agreement between the angular dependence of the oscillations and the theoretical expectations. Further evidence of strong electron correlations is realized through the observation of signatures of non-Fermi liquid transport as well as a large Kadowaki-Woods ratio. These collective findings, coupled with knowledge of the evolution of the electronic state across the Ruddlesden-Popper iridate series, establishes monoclinic SrIrO3 as a topological semimetal on the boundary of the Mott metal-insulator transition.
| Type: | Article |
|---|---|
| Title: | Evidence for strong electron correlations in a nonsymmorphic Dirac semimetal |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1038/s41535-021-00396-5 |
| Publisher version: | https://doi.org/10.1038/s41535-021-00396-5 |
| Language: | English |
| Additional information: | © 2021 Springer Nature Limited. This article is licensed under a Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/). |
| Keywords: | Electronic properties and materials, Topological matter |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10138911 |
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