Anisotropic magnetic excitations from single-chirality antiferromagnetic state in Ca-kapellasite
We present a ^{35}Cl NMR study for the spin S=1/2 perfect kagome antiferromagnet Ca-kapellasite [CaCu_{3}(OH)_{6}Cl_{2}·0.6H_{2}O] with a magnetic transition at T^{*}=7.2K. The static magnetic structure in the ground state has been determined to be a chirality-ordered Q=0 state, which is selected by...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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American Physical Society
2020-06-01
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| Series: | Physical Review Research |
| Online Access: | http://doi.org/10.1103/PhysRevResearch.2.023269 |
| _version_ | 1797211410466340864 |
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| author | Y. Ihara H. Yoshida K. Arashima M. Hirata T. Sasaki |
| author_facet | Y. Ihara H. Yoshida K. Arashima M. Hirata T. Sasaki |
| author_sort | Y. Ihara |
| collection | DOAJ |
| description | We present a ^{35}Cl NMR study for the spin S=1/2 perfect kagome antiferromagnet Ca-kapellasite [CaCu_{3}(OH)_{6}Cl_{2}·0.6H_{2}O] with a magnetic transition at T^{*}=7.2K. The static magnetic structure in the ground state has been determined to be a chirality-ordered Q=0 state, which is selected by a finite Dzyaloshinskii-Moriya interaction. The low-energy magnetic excitations in the ordered state are investigated by a nuclear spin-lattice relaxation rate measurement. We detect a weakly temperature-dependent contribution in the magnetic fluctuations perpendicular to the kagome plane in addition to the dispersive spin-wave contribution in the kagome plane. The low-energy magnetic excitations from the coplanar spin structure are attributed to the zero mode originating from the flat band in this kagome antiferromagnet. |
| first_indexed | 2024-04-24T10:26:03Z |
| format | Article |
| id | doaj.art-85dd9bd454a24aa9a0e8d7e4426b1be9 |
| institution | Directory Open Access Journal |
| issn | 2643-1564 |
| language | English |
| last_indexed | 2024-04-24T10:26:03Z |
| publishDate | 2020-06-01 |
| publisher | American Physical Society |
| record_format | Article |
| series | Physical Review Research |
| spelling | doaj.art-85dd9bd454a24aa9a0e8d7e4426b1be92024-04-12T16:54:54ZengAmerican Physical SocietyPhysical Review Research2643-15642020-06-012202326910.1103/PhysRevResearch.2.023269Anisotropic magnetic excitations from single-chirality antiferromagnetic state in Ca-kapellasiteY. IharaH. YoshidaK. ArashimaM. HirataT. SasakiWe present a ^{35}Cl NMR study for the spin S=1/2 perfect kagome antiferromagnet Ca-kapellasite [CaCu_{3}(OH)_{6}Cl_{2}·0.6H_{2}O] with a magnetic transition at T^{*}=7.2K. The static magnetic structure in the ground state has been determined to be a chirality-ordered Q=0 state, which is selected by a finite Dzyaloshinskii-Moriya interaction. The low-energy magnetic excitations in the ordered state are investigated by a nuclear spin-lattice relaxation rate measurement. We detect a weakly temperature-dependent contribution in the magnetic fluctuations perpendicular to the kagome plane in addition to the dispersive spin-wave contribution in the kagome plane. The low-energy magnetic excitations from the coplanar spin structure are attributed to the zero mode originating from the flat band in this kagome antiferromagnet.http://doi.org/10.1103/PhysRevResearch.2.023269 |
| spellingShingle | Y. Ihara H. Yoshida K. Arashima M. Hirata T. Sasaki Anisotropic magnetic excitations from single-chirality antiferromagnetic state in Ca-kapellasite Physical Review Research |
| title | Anisotropic magnetic excitations from single-chirality antiferromagnetic state in Ca-kapellasite |
| title_full | Anisotropic magnetic excitations from single-chirality antiferromagnetic state in Ca-kapellasite |
| title_fullStr | Anisotropic magnetic excitations from single-chirality antiferromagnetic state in Ca-kapellasite |
| title_full_unstemmed | Anisotropic magnetic excitations from single-chirality antiferromagnetic state in Ca-kapellasite |
| title_short | Anisotropic magnetic excitations from single-chirality antiferromagnetic state in Ca-kapellasite |
| title_sort | anisotropic magnetic excitations from single chirality antiferromagnetic state in ca kapellasite |
| url | http://doi.org/10.1103/PhysRevResearch.2.023269 |
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