A magnetic continuum observed by terahertz spectroscopy in a quantum spin liquid candidate BaCo${}_2$(AsO${}_4$)${}_2$

Abstract

Quantum spin liquids (QSLs) are topologically ordered exotic states of matter that host fractionalized excitations. Kitaev proposed a particular route towards a QSL via strongly bond-dependent interactions on the hexagonal lattice. A number of candidate Kitaev QSL materials have been pursued, but all have appreciable non-Kitaev interactions, which put these systems far from the QSL regime. Using time-domain terahertz spectroscopy (TDTS) we observed a broad magnetic continuum over a wide range of temperature and field in the honeycomb cobalt-based magnet, BaCo${}_2$(AsO${}_4$)${}_2$, which has been proposed to be more ideal versions of a Kitaev QSL. Applying a small in-plane magnetic field of $\sim$ 0.5 T suppresses the magnetic order and at at even higher fields gives rise to a spin-polarized state. With 4T magnetic field oriented principally out-of-plane, a broad magnetic continuum was observed that could be consistent with a field induced QSL. Our results indicate BaCo${}_2$(AsO${}_4$)${}_2$ to be a promising QSL candidate.

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Cited by in corpus (41)

• Beyond Kitaev physics in strong spin-orbit coupled magnets
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• Experimental signatures of quantum and topological states in frustrated magnetism
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• Triple-q order in Na${}_2$Co${}_2$TeO${}_6$ from proximity to hidden-SU(2)-symmetric point
• Kitaev Quantum Spin Liquids
• Quantum Phases in the Honeycomb-Lattice $J_1$--$J_3$ Ferro-Antiferromagnetic Model
• Continuum of spin excitations in an ordered magnet
• Proximate Dirac spin liquid in honeycomb lattice $J_1$-$J_3$ XXZ model: Numerical study and application to cobaltates
• Spin vestigial orders in extended Heisenberg-Kitaev models near hidden SU(2) points: Application to Na${}_2$Co${}_2$TeO${}_6$
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• Comparative Raman Scattering Study of Crystal Field Excitations in Co-based Quantum Magnets
• Suppression of Antiferromagnetic Order by Strain in Honeycomb Cobaltate: Implication for Quantum Spin Liquid
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• Single-crystal study of the honeycomb XXZ magnet BaCo${}_2$(PO${}_4$)${}_2$ in magnetic fields
• Ferrimagnetism from triple-q order in Na${}_2$Co${}_2$TeO${}_6$
• Charge-Neutral Electronic Excitations in Quantum Insulators
• BaCo${}_2$(AsO${}_4$)${}_2$: Strong Kitaev, After All
• Disorder-induced excitation continuum in a spin-1/2 cobaltate on a triangular lattice
• Probing critical spin fluctuations with a composite magnetoelectric method: A case study on a Kitaev spin liquid candidate Na${}_3$Co${}_2$SbO${}_6$
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• Field induced non-BEC transitions in frustrated magnets
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• Chemical tuning of a honeycomb magnet through a critical point
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