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arXiv 2004.03827cond-mat.str-el
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钙黄长石单手征反铁磁态的各向异性磁激发

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

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

摘要:

本文报道了自旋$S=1/2$完全可果梅反铁磁体钙钾镁矾(CaCu $_{3}$(OH)$_{6}$ Cl $_{2}\cdot$ 0. 6 H $_{2}$ O)在$T^{\ast}=7.2$ K处的磁跃迁的$^{35}$ Cl NMR研究。在基态的静态磁结构已被确定为手性有序的$Q=0$状态,这是由有限的Dzyaloshinskiii-Moriya相互作用选择。利用核自旋-晶格弛豫速率测量研究了有序态的低能磁激发。我们检测到一个弱的温度依赖的贡献,除了在戈薇平面的色散自旋波的贡献,在垂直于戈薇平面的磁波动。来自共面自旋结构的低能量磁激发归因于源于该可果美反铁磁体中的平带的零模。

英文摘要:

We present a $^{35}$Cl NMR study for spin $S=1/2$ perfect kagome antiferromagnet Ca-kapellasite (CaCu$_{3}$(OH)$_{6}$Cl$_{2}\cdot$0.6H$_{2}$O) with a magnetic transition at $T^{\ast}=7.2$ 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 the 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.

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