期刊
CHINESE PHYSICS LETTERS
卷 34, 期 7, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0256-307X/34/7/077502
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资金
- National Key Research and Development Program of China [2016YFA0300502, 2016YFA0300503, 2016YFA0300604, 2016YF0300300, 2016YFA0300802]
- National Natural Science Foundation of China [11421092, 11474330, 11574359, 11674406, 11374346, 11674375]
- National Basic Research Program of China (973 Program) [2015CB921304]
- National Thousand-Young-Talents Program of China
- Chinese Academy of Sciences [XDB07020000, XDB07020200, XDB07020300]
- DOE-BES [DE-FG02-04ER46148]
We report a new kagome quantum spin liquid candidate Cu3Zn(OH)(6)FBr, which does not experience any phase transition down to 50 mK, more than three orders lower than the antiferromagnetic Curie-Weiss temperature (similar to 200 K). A clear gap opening at low temperature is observed in the uniform spin susceptibility obtained from F-19 nuclear magnetic resonance measurements. We observe the characteristic magnetic field dependence of the gap as expected for fractionalized spin-1/2 spinon excitations. Our experimental results provide firm evidence for spin fractionalization in a topologically ordered spin system, resembling charge fractionalization in the fractional quantum Hall state.
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