Evidence for strong electron correlations in a nonsymmorphic Dirac semimetal

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 diffic...

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Autores principales:	Yu-Te Hsu, Danil Prishchenko, Maarten Berben, Matija Čulo, Steffen Wiedmann, Emily C. Hunter, Paul Tinnemans, Tomohiro Takayama, Vladimir Mazurenko, Nigel E. Hussey, Robin S. Perry
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Materials of engineering and construction. Mechanics of materials TA401-492 Atomic physics. Constitution and properties of matter QC170-197
Acceso en línea:	https://doaj.org/article/ee596eb98cb54618b0d8f8d2bffb796e
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spelling	oai:doaj.org-article:ee596eb98cb54618b0d8f8d2bffb796e2021-11-14T12:42:33ZEvidence for strong electron correlations in a nonsymmorphic Dirac semimetal10.1038/s41535-021-00396-52397-4648https://doaj.org/article/ee596eb98cb54618b0d8f8d2bffb796e2021-11-01T00:00:00Zhttps://doi.org/10.1038/s41535-021-00396-5https://doaj.org/toc/2397-4648Abstract 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.Yu-Te HsuDanil PrishchenkoMaarten BerbenMatija ČuloSteffen WiedmannEmily C. HunterPaul TinnemansTomohiro TakayamaVladimir MazurenkoNigel E. HusseyRobin S. PerryNature PortfolioarticleMaterials of engineering and construction. Mechanics of materialsTA401-492Atomic physics. Constitution and properties of matterQC170-197ENnpj Quantum Materials, Vol 6, Iss 1, Pp 1-6 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Materials of engineering and construction. Mechanics of materials TA401-492 Atomic physics. Constitution and properties of matter QC170-197
spellingShingle	Materials of engineering and construction. Mechanics of materials TA401-492 Atomic physics. Constitution and properties of matter QC170-197 Yu-Te Hsu Danil Prishchenko Maarten Berben Matija Čulo Steffen Wiedmann Emily C. Hunter Paul Tinnemans Tomohiro Takayama Vladimir Mazurenko Nigel E. Hussey Robin S. Perry Evidence for strong electron correlations in a nonsymmorphic Dirac semimetal
description	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.
format	article
author	Yu-Te Hsu Danil Prishchenko Maarten Berben Matija Čulo Steffen Wiedmann Emily C. Hunter Paul Tinnemans Tomohiro Takayama Vladimir Mazurenko Nigel E. Hussey Robin S. Perry
author_facet	Yu-Te Hsu Danil Prishchenko Maarten Berben Matija Čulo Steffen Wiedmann Emily C. Hunter Paul Tinnemans Tomohiro Takayama Vladimir Mazurenko Nigel E. Hussey Robin S. Perry
author_sort	Yu-Te Hsu
title	Evidence for strong electron correlations in a nonsymmorphic Dirac semimetal
title_short	Evidence for strong electron correlations in a nonsymmorphic Dirac semimetal
title_full	Evidence for strong electron correlations in a nonsymmorphic Dirac semimetal
title_fullStr	Evidence for strong electron correlations in a nonsymmorphic Dirac semimetal
title_full_unstemmed	Evidence for strong electron correlations in a nonsymmorphic Dirac semimetal
title_sort	evidence for strong electron correlations in a nonsymmorphic dirac semimetal
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/ee596eb98cb54618b0d8f8d2bffb796e
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Evidence for strong electron correlations in a nonsymmorphic Dirac semimetal

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