【摘 要】
：
With Zn substitution to the three-dimensional antiferromagnetically ordered barlowite Cu4(OH)6FBr,Cu3Zn(OH)6FBr shows no magnetic phase transition down to 50 mK
【机 构】
：
Beijing National Laboratory for Condensed Matter Physics and Institute of Physics,Chinese Academy of
论文部分内容阅读
With Zn substitution to the three-dimensional antiferromagnetically ordered barlowite Cu4(OH)6FBr,Cu3Zn(OH)6FBr shows no magnetic phase transition down to 50 mK,and the system is suggested to be a two-dimensional kagomé quantum spin liquid[Chin.Phys.Lett.34 077502(2017)].A key issue to identify such phase diagram is the exact chemical formula of the substituted compound.With Cu L-edge x-ray absorption spectrum(XAS)combined with the MultiX XAS calculations,we evaluate the Cu concentration in a nominal Cu3Zn(OH)6FBr sample.Our results show that although the Cu concentration is 2.80,close to the expected value,there is 34％residual Cu occupation in intersite layers between kagomé layers.Thus the Zn substitution of the intersite layers is not complete,and likely it intrudes the kagomé layers.
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