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

Y. Ihara, H. Yoshida, K. Arashima, M. Hirata, T. Sasaki

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8 Citations (Scopus)


We present a Cl35 NMR study for the spin S=1/2 perfect kagome antiferromagnet Ca-kapellasite [CaCu3(OH)6Cl2·0.6H2O] 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.

Original languageEnglish
Article number023269
JournalPhysical Review Research
Issue number2
Publication statusPublished - 2020 Jun


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