作者: Fu, Y (Fu, Ying); Lin, ML (Lin, Miao-Ling); Wang, L (Wang, Le); Liu, QY (Liu, Qiye); Huang, LL (Huang, Lianglong); Jiang, WR (Jiang, Wenrui); Hao, ZY (Hao, Zhanyang); Liu, C (Liu, Cai); Zhang, H (Zhang, Hu); Shi, XQ (Shi, Xingqiang); Zhang, J (Zhang, Jun); Dai, JF (Dai, Junfeng); Yu, DP (Yu, Dapeng); Ye, F (Ye, Fei); Lee, PA (Lee, Patrick A.); Tan, PH (Tan, Ping-Heng); Mei, JW (Mei, Jia-Wei)

来源出版物: NATURE COMMUNICATIONS 卷: 12 期: 1 文献号: 3048 DOI: 10.1038/s41467-021-23381-9 出版年: MAY 24 2021

摘要: Beyond the absence of long-range magnetic orders, the most prominent feature of the elusive quantum spin liquid (QSL) state is the existence of fractionalized spin excitations, i.e., spinons. When the system orders, the spin-wave excitation appears as the bound state of the spinon-antispinon pair. Although scarcely reported, a direct comparison between similar compounds illustrates the evolution from spinon to magnon. Here, we perform the Raman scattering on single crystals of two quantum kagome antiferromagnets, of which one is the kagome QSL candidate Cu3Zn(OH)(6)FBr, and another is an antiferromagnetically ordered compound EuCu3(OH)(6)Cl-3. In Cu3Zn(OH)(6)FBr, we identify a unique one spinon-antispinon pair component in the E-2g magnetic Raman continuum, providing strong evidence for deconfined spinon excitations. In contrast, a sharp magnon peak emerges from the one-pair spinon continuum in the E-g magnetic Raman response once EuCu3(OH)(6)Cl-3 undergoes the antiferromagnetic order transition. From the comparative Raman studies, we can regard the magnon mode as the spinon-antispinon bound state, and the spinon confinement drives the magnetic ordering. Spinon excitations of a Kagome quantum spin liquid are expected to give rise to a magnetic continuum in Raman spectroscopy. Here, the authors report a magnetic Raman continuum in the Kagome spin liquid candidate Cu3Zn(OH)(6)FBr, in contrast to a sharp magnon Raman peak in the Kagome antiferromagnet EuCu3(OH)(6)Cl-3.

入藏号: WOS:000658686600002

PubMed ID: 34031422

作者识别号:

作者        Web of Science ResearcherID        ORCID 号

Tan, Ping-Heng         D-1137-2009         0000-0001-6575-1516

Lin, Miao-Ling         T-7309-2017         0000-0001-5838-8237

ISSN: 2041-1723

Full Text: https://www.nature.com/articles/s41467-021-23381-9