$\mu$SR Insight into the Impurity Problem in Quantum Kagome Antiferromagnets

Abstract

Impurities, which are inherently present in any real material, may play an important role in the magnetism of frustrated spin systems with spin-liquid ground states. We address the impurity issue in quantum kagome antiferromagnets by investigating ZnCu${}_3$(OH)${}_6$SO${}_4$ (Zn-brochantite) by means of muon spin spectroscopy. We show that muons couple to the impurity magnetism, originating from Cu-Zn intersite disorder, and that the impurities are highly correlated with the kagome spins, allowing us to probe the intrinsic kagome physics via a Kondo-like effect. The low-temperature plateau in local susceptibility identifies the spin-liquid ground state as being gapless. The corresponding spin fluctuations exhibit an unconventional spectral density and an intriguing field dependence.

published version

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Cited by in corpus (16)

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• Nature of the randomness-induced quantum spin liquids in two dimensions
• Symmetry Reduction in the Quantum Kagome Antiferromagnet Herbertsmithite
• Experimental signatures of quantum and topological states in frustrated magnetism
• Randomness-induced quantum spin liquid behavior in the s=1/2 random J1-J2 Heisenberg antiferromagnet on the honeycomb lattice
• Nature of the spin liquid ground state in a breathing kagome compound studied by NMR and series expansion
• Negative-vector-chirality 120${}^{\circ }$ spin structure in the defect- and distortion-free quantum kagome antiferromagnet YCu${}_3$(OH)${}_6$Cl${}_3$
• Origin of magnetic moments and presence of a resonating valence bond state in Ba${}_2$YIrO${}_6$
• Heat Transport in Herbertsmithite: Can a Quantum Spin Liquid Survive Disorder?
• From magnetic order to quantum disorder: a $\mu$SR study of the Zn-barlowite series of $S=\frac{1}{2}$ kagomé antiferromagnets, Zn${}_x$Cu${}_{4-x}$(OH)${}_6$FBr
• Kondo screening in a charge-insulating spinon metal
• Field-Induced Instability of a Gapless Spin Liquid with a Spinon Fermi Surface
• New state of matter: heavy-fermion systems, quantum spin liquids, quasicrystals, cold gases, and high temperature superconductors
• Thermodynamic, dynamic and transport properties of quantum spin liquid in herbertsmithite from experimental and theoretical point of view