Multiple quantum phase transitions of different nature in the topological kagome magnet Co3Sn2−x In x S2
Abstract The exploration of topological electronic phases that result from strong electronic correlations is a frontier in condensed matter physics. One class of systems that is currently emerging as a platform for such studies are so-called kagome magnets based on transition metals. Using muon spin...
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2021
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oai:doaj.org-article:66c114d864b2491ea5adb4b7cf2b23452021-12-02T14:59:15ZMultiple quantum phase transitions of different nature in the topological kagome magnet Co3Sn2−x In x S210.1038/s41535-021-00352-32397-4648https://doaj.org/article/66c114d864b2491ea5adb4b7cf2b23452021-05-01T00:00:00Zhttps://doi.org/10.1038/s41535-021-00352-3https://doaj.org/toc/2397-4648Abstract The exploration of topological electronic phases that result from strong electronic correlations is a frontier in condensed matter physics. One class of systems that is currently emerging as a platform for such studies are so-called kagome magnets based on transition metals. Using muon spin-rotation, we explore magnetic correlations in the kagome magnet Co3Sn2−xInxS2 as a function of In-doping, providing putative evidence for an intriguing incommensurate helimagnetic (HM) state. Our results show that, while the undoped sample exhibits an out-of-plane ferromagnetic (FM) ground state, at 5% of In-doping the system enters a state in which FM and in-plane antiferromagnetic (AFM) phases coexist. At higher doping, a HM state emerges and becomes dominant at the critical doping level of only x cr,1 ≃ 0.3. This indicates a zero temperature first order quantum phase transition from the FM, through a mixed state, to a helical phase at x cr,1. In addition, at x cr,2 ≃ 1, a zero temperature second order phase transition from helical to paramagnetic phase is observed, evidencing a HM quantum critical point (QCP) in the phase diagram of the topological magnet Co3Sn2−xInxS2. The observed diversity of interactions in the magnetic kagome lattice drives non-monotonous variations of the topological Hall response of this system.Z. GuguchiaH. ZhouC. N. WangJ.-X. YinC. MielkeS. S. TsirkinI. BelopolskiS.-S. ZhangT. A. CochranT. NeupertR. KhasanovA. AmatoS. JiaM. Z. HasanH. LuetkensNature PortfolioarticleMaterials of engineering and construction. Mechanics of materialsTA401-492Atomic physics. Constitution and properties of matterQC170-197ENnpj Quantum Materials, Vol 6, Iss 1, Pp 1-8 (2021) |
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Materials of engineering and construction. Mechanics of materials TA401-492 Atomic physics. Constitution and properties of matter QC170-197 |
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Materials of engineering and construction. Mechanics of materials TA401-492 Atomic physics. Constitution and properties of matter QC170-197 Z. Guguchia H. Zhou C. N. Wang J.-X. Yin C. Mielke S. S. Tsirkin I. Belopolski S.-S. Zhang T. A. Cochran T. Neupert R. Khasanov A. Amato S. Jia M. Z. Hasan H. Luetkens Multiple quantum phase transitions of different nature in the topological kagome magnet Co3Sn2−x In x S2 |
| description |
Abstract The exploration of topological electronic phases that result from strong electronic correlations is a frontier in condensed matter physics. One class of systems that is currently emerging as a platform for such studies are so-called kagome magnets based on transition metals. Using muon spin-rotation, we explore magnetic correlations in the kagome magnet Co3Sn2−xInxS2 as a function of In-doping, providing putative evidence for an intriguing incommensurate helimagnetic (HM) state. Our results show that, while the undoped sample exhibits an out-of-plane ferromagnetic (FM) ground state, at 5% of In-doping the system enters a state in which FM and in-plane antiferromagnetic (AFM) phases coexist. At higher doping, a HM state emerges and becomes dominant at the critical doping level of only x cr,1 ≃ 0.3. This indicates a zero temperature first order quantum phase transition from the FM, through a mixed state, to a helical phase at x cr,1. In addition, at x cr,2 ≃ 1, a zero temperature second order phase transition from helical to paramagnetic phase is observed, evidencing a HM quantum critical point (QCP) in the phase diagram of the topological magnet Co3Sn2−xInxS2. The observed diversity of interactions in the magnetic kagome lattice drives non-monotonous variations of the topological Hall response of this system. |
| format |
article |
| author |
Z. Guguchia H. Zhou C. N. Wang J.-X. Yin C. Mielke S. S. Tsirkin I. Belopolski S.-S. Zhang T. A. Cochran T. Neupert R. Khasanov A. Amato S. Jia M. Z. Hasan H. Luetkens |
| author_facet |
Z. Guguchia H. Zhou C. N. Wang J.-X. Yin C. Mielke S. S. Tsirkin I. Belopolski S.-S. Zhang T. A. Cochran T. Neupert R. Khasanov A. Amato S. Jia M. Z. Hasan H. Luetkens |
| author_sort |
Z. Guguchia |
| title |
Multiple quantum phase transitions of different nature in the topological kagome magnet Co3Sn2−x In x S2 |
| title_short |
Multiple quantum phase transitions of different nature in the topological kagome magnet Co3Sn2−x In x S2 |
| title_full |
Multiple quantum phase transitions of different nature in the topological kagome magnet Co3Sn2−x In x S2 |
| title_fullStr |
Multiple quantum phase transitions of different nature in the topological kagome magnet Co3Sn2−x In x S2 |
| title_full_unstemmed |
Multiple quantum phase transitions of different nature in the topological kagome magnet Co3Sn2−x In x S2 |
| title_sort |
multiple quantum phase transitions of different nature in the topological kagome magnet co3sn2−x in x s2 |
| publisher |
Nature Portfolio |
| publishDate |
2021 |
| url |
https://doaj.org/article/66c114d864b2491ea5adb4b7cf2b2345 |
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