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...
| Main Authors: | , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
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Nature Portfolio
2021-11-01
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| Series: | npj Quantum Materials |
| Online Access: | https://doi.org/10.1038/s41535-021-00396-5 |
| _version_ | 1819003270012600320 |
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| 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 |
| collection | DOAJ |
| 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. |
| first_indexed | 2024-12-20T23:18:20Z |
| format | Article |
| id | doaj.art-ee596eb98cb54618b0d8f8d2bffb796e |
| institution | Directory Open Access Journal |
| issn | 2397-4648 |
| language | English |
| last_indexed | 2024-12-20T23:18:20Z |
| publishDate | 2021-11-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | npj Quantum Materials |
| spelling | doaj.art-ee596eb98cb54618b0d8f8d2bffb796e2022-12-21T19:23:35ZengNature Portfolionpj Quantum Materials2397-46482021-11-01611610.1038/s41535-021-00396-5Evidence for strong electron correlations in a nonsymmorphic Dirac semimetalYu-Te Hsu0Danil Prishchenko1Maarten Berben2Matija Čulo3Steffen Wiedmann4Emily C. Hunter5Paul Tinnemans6Tomohiro Takayama7Vladimir Mazurenko8Nigel E. Hussey9Robin S. Perry10High Field Magnet Laboratory (HFML-EMFL) and Institute for Molecules and Materials, Radboud UniversityDepartment of Theoretical Physics and Applied Mathematics, Ural Federal UniversityHigh Field Magnet Laboratory (HFML-EMFL) and Institute for Molecules and Materials, Radboud UniversityHigh Field Magnet Laboratory (HFML-EMFL) and Institute for Molecules and Materials, Radboud UniversityHigh Field Magnet Laboratory (HFML-EMFL) and Institute for Molecules and Materials, Radboud UniversitySchool of Physics and Astronomy, The University of EdinburghDepartment of Solid State Chemistry, Radboud UniversityMax Planck Institute for Solid State ResearchDepartment of Theoretical Physics and Applied Mathematics, Ural Federal UniversityHigh Field Magnet Laboratory (HFML-EMFL) and Institute for Molecules and Materials, Radboud UniversityLondon Centre for Nanotechnology and Department of Physics and Astronomy, University College LondonAbstract 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.https://doi.org/10.1038/s41535-021-00396-5 |
| spellingShingle | 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 npj Quantum Materials |
| title | 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_short | Evidence for strong electron correlations in a nonsymmorphic Dirac semimetal |
| title_sort | evidence for strong electron correlations in a nonsymmorphic dirac semimetal |
| url | https://doi.org/10.1038/s41535-021-00396-5 |
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