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The kagome Heisenberg antiferromagnet YCu3(OH)6.5Br2.5: a review
Xun Chen1, HaiJun Liao2, Yuesheng Li3
1Huazhong University of Science and Technology, Wuhan National High Magnetic Field Center and School of Physics, Huazhong University of Science and Technology, 430074 Wuhan, China, Wuhan, Hubei, 430074, CHINA.
Abstract:
Quantum spin liquids (QSLs), first proposed by Anderson back in 1973 through the resonating-valence-bond state, are expected to be central to understanding high-temperature superconductivity and advancing topological quantum computation. However, conclusive experimental evidence for QSLs remains elusive, largely due to two factors: first, most two-dimensional strongly frustrated spin models are not exactly solvable, leading to inconsistent results across numerical methods; second, real materials often include spin-spin interaction perturbations that disrupt the fragile QSL ground state. This review focuses on the kagome Heisenberg antiferromagnet (KHA), which is considered a promising experimental realization of QSLs. Among the existing KHA candidates, YCu3(OH)6.5Br2.5(YCOB) stands out as the most promising, showing no conventional magnetic ordering down to 50 mK despite a strong antiferromagnetic coupling of ∼60 K. This paper reviews key experimental and theoretical studies on YCOB, addressing ongoing challenges and future directions.
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