Correlated impurities and intrinsic spin liquid physics in the kagome material Herbertsmithite

Abstract

Low energy inelastic neutron scattering on single crystals of the kagome spin liquid compound ZnCu3(OD)6Cl2 (Herbertsmithite) reveals antiferromagnetic correlations between impurity spins for energy transfers E < 0.8 meV (~J/20). The momentum dependence differs significantly from higher energy scattering which arises from the intrinsic kagome spins. The low energy fluctuations are characterized by diffuse scattering near wavevectors (1 0 0) and (0 0 3/2), which is consistent with antiferromagnetic correlations between pairs of nearest neighbor Cu impurities on adjacent triangular (Zn) interlayers. The corresponding impurity lattice resembles a simple cubic lattice in the dilute limit below the percolation threshold. Such an impurity model can describe prior neutron, NMR, and specific heat data. The low energy neutron data are consistent with the presence of a small spin-gap (Delta ~ 0.7 meV) in the kagome layers, similar to that recently observed by NMR. The ability to distinguish the scattering due to Cu impurities from that of the planar kagome Cu spins provides a new avenue for probing intrinsic spin liquid physics.

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• Chiral spin liquid on kagome antiferromagnet induced by Dzyaloshinskii-Moriya interaction
• Symmetry Reduction in the Quantum Kagome Antiferromagnet Herbertsmithite
• Survival of itinerant excitations and quantum spin state transitions in YbMgGaO${}_4$ with chemical disorder
• Competing magnetic orders and spin liquids in two- and three-dimensional kagome systems: A pseudo-fermion functional renormalization group perspective
• The effect of spin-orbit coupling on the effective-spin correlation in YbMgGaO4
• Experimental signatures of quantum and topological states in frustrated magnetism
• Functional-renormalization-group analysis of Dzyaloshinsky-Moriya and Heisenberg spin interactions on the kagome lattice
• From Claringbullite to a new spin liquid candidate Cu${}_3$Zn(OH)${}_6$FCl
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• Possible gapless spin liquid in a rare-earth kagomé lattice magnet Tm${}_3$Sb${}_3$Zn${}_2$O${}_{14}$
• Site-Specific Structure at Multiple Length Scales in Kagome Quantum Spin Liquid Candidates
• $\mu$SR Insight into the Impurity Problem in Quantum Kagome Antiferromagnets
• Classification of symmetry fractionalization in gapped ${\mathbb{Z}}_2$ spin liquids
• Disorder-induced spin-liquid-like behavior in kagome-lattice compounds
• Stripe-yz magnetic order in the triangular-lattice antiferromagnet KCeS2
• Nuclear and Magnetic Structures of the Frustrated Quantum Antiferromagnet Barlowite, Cu${}_4$(OH)${}_6$FBr
• Electrodynamics of quantum spin liquids
• Dynamical spin correlations of the kagome antiferromagnet
• Emergent moments and random singlet physics in a Majorana spin liquid
• New state of matter: heavy-fermion systems, quantum spin liquids, quasicrystals, cold gases, and high temperature superconductors
• Specific Heat of the Kagome Antiferromagnet Herbertsmithite in High Magnetic Fields
• Nonlocal effects of low-energy excitations in quantum-spin-liquid candidate Cu${}_3$Zn(OH)${}_6$FBr
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• Recent progress on magnetic-field studies on quantum-spin-liquid candidates
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• Structure Factors of the Kagome-Lattice Heisenberg antiferromagnets at finite temperatures
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• Exceptional dynamics of interacting spin liquids
• Excitation Spectrum and Spin Hamiltonian of the Frustrated Quantum Ising Magnet Pr${}_3$BWO${}_9$
• Evidence for the topological order in a kagome antiferromagnet
• High energy spin excitations in the quantum spin liquid candidate Zn-barlowite probed by resonant inelastic x-ray scattering
• Heat conduction in herbertsmithite: field dependence at the onset of the quantum spin liquid regime
• Signatures for spinons in the quantum spin liquid candidate Ca${}_{10}$Cr${}_7$O${}_{28}$
• Evidence for a Parity Broken Monoclinic Ground State in the S = 1/2 Kagomé Antiferromagnet Herbertsmithite
• Magnetically ordered and kagome quantum spin liquid states in the Zn-doped claringbullite series
• Theory of quantum kagome ice and vison zero modes
• Rapid filling of the spin gap with temperature in the Schwinger-boson mean-field theory of the antiferromagnetic Heisenberg kagome model
• Chemo-Structural Disorder in the kagomé spin $S$ = 1/2 systems ZnCu${}_3$(OH)${}_6$Cl${}_2$ and YCu${}_3$(OH)${}_6$Br${}_2$[Br${}_x$(OH)${}_{1-x}$]
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