Gapless quantum spin liquid in the S = 1 2 anisotropic kagome antiferromagnet ZnCu3(OH)6SO4

We have successfully synthesized the new S = 1 2 anisotropic kagome antiferromagnet ZnCu3(OH)6SO4 and determined its structure by synchrotron x-ray diffraction. No magnetic ordering is observed down to 50 mK, despite a moderately high Weiss temperature of w ∼ −79 K, indicating that the compound is a...

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Published inNew journal of physics Vol. 16; no. 9; pp. 093011 - 93022
Main Authors Li, Yuesheng, Pan, Bingying, Li, Shiyan, Tong, Wei, Ling, Langsheng, Yang, Zhaorong, Wang, Junfeng, Chen, Zhongjun, Wu, Zhonghua, Zhang, Qingming
Format Journal Article
LanguageEnglish
Published Bristol IOP Publishing 2014
Subjects
Antiferromagnetism
kagome antiferromagnet
low-energy excitation
Physics
quantum spin liquid
spin frustration
Spin liquid
Synchrotron radiation
Temperature
Temperature dependence
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Summary:We have successfully synthesized the new S = 1 2 anisotropic kagome antiferromagnet ZnCu3(OH)6SO4 and determined its structure by synchrotron x-ray diffraction. No magnetic ordering is observed down to 50 mK, despite a moderately high Weiss temperature of w ∼ −79 K, indicating that the compound is a new quantum spin liquid (QSL) candidate. A linear temperature dependence of the magnetic heat capacity is found at 6 ∼ 15 K and below 0.6 K. Temperature-independent intrinsic susceptibilities are observed exactly in both temperature ranges. This consistently suggests a gapless QSL below 0.6 K, which may evolve from an unconventional quantum spin state at higher temperatures (6 ∼ 15 K).
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ISSN:1367-2630
DOI:10.1088/1367-2630/16/9/093011