A novel Kagome uud-ddu spin order in Heisenberg spin-1/2 Clinoatacamite Cu₄(OH)₆Cl₂, the parent compound of Herbertsmithite

2024/11/02 by 旭光 鄭, Masato Hagihala, Zheng, X. G. +11
Chemical Engineering · Chemistry · Physics and Astronomy · #Advanced Condensed Matter Physics #Catalysis and Oxidation Reactions #FOS: Physical sciences #Quantum Physics (quant-ph) #Radioactive element chemistry and processing #Strongly Correlated Electrons (cond-mat.str-el)

paper · pdf · doi:10.48550/arxiv.2411.01277

openalex publication_date 2024/11/02 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

The newly identified field-induced up-up-down order in Ba₃CoSb₂O₉ etc. renewed attention on exotic phases in spin-1/2 triangular-lattice antiferromagnets. Here, we report a unique zero-field noncoplanar up,up,down, down,down,up Kagome spin order in spin-1/2 antiferromagnet Clinoatacamite, Cu₄(OH)₆Cl₂, which consists of weakly-coupled Kagome layers and was known as the parent compound for the most researched spin liquid candidate Herbertsmithite ZnCu₃(OH)₆Cl₂. The two-dimensional uud-ddu Kagome order develops below T_N1 = 18.1 K in Clinoatacamite before a further transition into a three-dimensional magnetic order at low temperatures below T_N2 ~ 6.4 K with persistent spin fluctuations. The present work reveals a new unpredicted Kagome order in a readily accessible temperature range in the parent compound of a well-studied spin liquid. In addition, it has also solved a puzzling issue for a mysterious magnetic phase.

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