Recently, Prof. Ping-Heng Tan’s group, collaborated with Prof. Jia-Wei Mei’s group in Southern University of Science and Technology, utilized ultralow-frequency and polarized Raman spectroscopy to perform a systematic study on the lattice structure and magnetic excitation of single-crystal Cu3Zn(OH)6FBr, which was prepared by Prof. Jia-Wei Mei’s group. They exclude the Kagome lattice distortion in the temperature range of 4-300 K and depicted a remarkable E2g magnetic Raman continuum, which can be decomposed into one spinon-antispinon pair (1P) and two spinon-antispinon pair (2P) excitation. The 1P continuum is the characteristic fingerprint. Then they compared the magnetic excitation between Kagome QSL state of Cu3Zn(OH)6FBr and Kagome antiferromagnetic ordered state of EuCu3(OH)6Cl3, in which a sharp one-magnon Raman peak is emerged from the 1P continuum in EuCu3 (OH)6Cl3 when temperature is below the Néel temperature. In this well-defined experiment, they claimed that the magnon mode can be regarded as spinon-antispinon bound state and the confinement of spinon can drive the transition from QSL to antiferromagnetic ordered state. The work entitled with “Dynamic fingerprint of fractionalized excitations in single-crystalline Cu3Zn(OH)6FBr” (DOI: 10.1038/s41467-021-23381-9) has been published in Nature Communications. Prof. Jia-Wei Mei and Prof. Ping-Heng Tan are the corresponding authors. Mr. Ying Fu and Dr. Miao-Ling Lin are the co-first authors. This work reveals that Cu3Zn(OH)6FBr is the ideal kagome QSL by the spectroscopic evidence of factionalized spin excitation, which paves ways to probe and study the magnetic excitation in QSL.
图1、(a) Schematical comparative Raman responses for the
antiferromagnetic EuCu3(OH)6Cl3 and QSL Cu3.18Zn0.82(OH)6FBr.
Temperature-dependent Raman responses and Raman susceptibility in (b)
Cu3.18Zn0.82(OH)6FBr and (c) EuCu3(OH)6Cl3.