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Anisotropic magnetic excitations from single-chirality antiferromagnetic state in Ca-kapellasite

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Title: Anisotropic magnetic excitations from single-chirality antiferromagnetic state in Ca-kapellasite
Authors: Ihara, Y. Browse this author →KAKEN DB
Yoshida, H. Browse this author
Arashima, K. Browse this author
Hirata, M. Browse this author
Sasaki, T. Browse this author
Issue Date: 2-Jun-2020
Publisher: American Physical Society (APS)
Journal Title: Physical Review Research
Volume: 2
Issue: 2
Start Page: 023269
Publisher DOI: 10.1103/PhysRevResearch.2.023269
Abstract: We present a Cl-35 NMR study for the spin S = 1/2 perfect kagome antiferromagnet Ca-kapellasite [CaCu3(OH)(6)Cl-2 center dot 0.6H(2)O] with a magnetic transition at T* = 7.2 K. 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.
Type: article
Appears in Collections:理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

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