| Autor: |
Y. Ihara, H. Yoshida, K. Arashima, M. Hirata, T. Sasaki |
| Jazyk: |
angličtina |
| Rok vydání: |
2020 |
| Předmět: |
|
| Zdroj: |
Physical Review Research, Vol 2, Iss 2, p 023269 (2020) |
| Druh dokumentu: |
article |
| ISSN: |
2643-1564 |
| DOI: |
10.1103/PhysRevResearch.2.023269 |
| Popis: |
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. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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