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

被引：8

作者：

Ihara, Y. ^{[1
]}

Yoshida, H. ^{[1
]}

Arashima, K. ^{[2
]}

Hirata, M. ^{[3
]}

Sasaki, T. ^{[3
]}

机构：

[1] Hokkaido Univ, Fac Sci, Dept Phys, Sapporo, Hokkaido 0600810, Japan

[2] Hokkaido Univ, Grad Sch Sci, Dept Condensed Matter Phys, Sapporo, Hokkaido 0600810, Japan

[3] Tohoku Univ, Inst Mat Res, Sendai, Miyagi 9808577, Japan

来源：

PHYSICAL REVIEW RESEARCH | 2020年 / 2卷 / 02期

关键词：

KAGOME; LIQUID;

D O I：

10.1103/PhysRevResearch.2.023269

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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.

引用

页数：5

共 35 条

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