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arXiv · 2311.11619

One-ninth magnetization plateau stabilized by spin entanglement in a kagome antiferromagnet

Sungmin Jeon·Dirk Wulferding·Youngsu Choi·Seungyeol Lee·Kiwan Nam·Kee Hoon Kim·Minseong Lee·Tae-Hwan Jang·Jae-Hoon Park·Suheon Lee·Sungkyun Choi·Chanhyeon Lee·Hiroyuki Nojiri·Kwang-Yong Choi
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Abstract

The spin-1/2 antiferromagnetic Heisenberg model on a Kagome lattice is geometrically frustrated, which is expected to promote the formation of many-body quantum entangled states. The most sought-after among these is the quantum spin liquid phase, but magnetic analogs of liquid, solid, and supersolid phases may also occur, producing fractional plateaus in the magnetization. Here, we investigate the experimental realization of these predicted phases in the Kagome material YCu3(OD)6+xBr3-x (x=0.5). By combining thermodynamic and Raman spectroscopic techniques, we provide evidence for fractionalized spinon excitations and observe the emergence of a 1/9 magnetization plateau. These observations establish YCu3(OD)6+xBr3-x as a model material for exploring the 1/9 plateau phase.

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Sungmin Jeon, Dirk Wulferding, Youngsu Choi, Seungyeol Lee, Kiwan Nam, Kee Hoon Kim, Minseong Lee, Tae-Hwan Jang, Jae-Hoon Park, Suheon Lee, Sungkyun Choi, Chanhyeon Lee, Hiroyuki Nojiri, Kwang-Yong Choi. 2023-11-20. One-ninth magnetization plateau stabilized by spin entanglement in a kagome antiferromagnet. https://arxiv.org/abs/2311.11619

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