A magnetic continuum in the cobalt-based honeycomb magnet BaCo2(AsO4)2

Xinshu Zhang; Yuanyuan Xu; T. Halloran; Ruidan Zhong; C. Broholm; R. J. Cava; N. Drichko; N. P. Armitage

doi:10.1038/s41563-022-01403-1

A magnetic continuum in the cobalt-based honeycomb magnet BaCo₂(AsO₄)₂

Xinshu Zhang, Yuanyuan Xu, T. Halloran, Ruidan Zhong, C. Broholm, R. J. Cava, N. Drichko, N. P. Armitage

Research output: Contribution to journal › Article › peer-review

23 Scopus citations

Abstract

Quantum spin liquids (QSLs) are topologically ordered states of matter that host fractionalized excitations. A particular route towards a QSL is via strongly bond-dependent interactions on the hexagonal lattice. A number of Ru- and Ir-based candidate Kitaev QSL materials have been pursued, but all have appreciable non-Kitaev interactions. Using time-domain terahertz spectroscopy, we observed a broad magnetic continuum over a wide range of temperatures and fields in the honeycomb cobalt-based magnet BaCo₂(AsO₄)₂, which has been proposed to be a more ideal version of a Kitaev QSL. Applying an in-plane magnetic field of ~0.5 T suppresses the magnetic order, and at higher fields, applying the field gives rise to a spin-polarized state. Under a 4 T magnetic field that was oriented principally out of plane, a broad magnetic continuum was observed that may be consistent with a field-induced QSL. Our results indicate BaCo₂(AsO₄)₂ is a promising QSL candidate.

Original language	English (US)
Pages (from-to)	58-63
Number of pages	6
Journal	Nature Materials
Volume	22
Issue number	1
DOIs	https://doi.org/10.1038/s41563-022-01403-1
State	Published - Jan 2023

All Science Journal Classification (ASJC) codes

General Chemistry
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering
General Materials Science

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title = "A magnetic continuum in the cobalt-based honeycomb magnet BaCo2(AsO4)2",

abstract = "Quantum spin liquids (QSLs) are topologically ordered states of matter that host fractionalized excitations. A particular route towards a QSL is via strongly bond-dependent interactions on the hexagonal lattice. A number of Ru- and Ir-based candidate Kitaev QSL materials have been pursued, but all have appreciable non-Kitaev interactions. Using time-domain terahertz spectroscopy, we observed a broad magnetic continuum over a wide range of temperatures and fields in the honeycomb cobalt-based magnet BaCo2(AsO4)2, which has been proposed to be a more ideal version of a Kitaev QSL. Applying an in-plane magnetic field of ~0.5 T suppresses the magnetic order, and at higher fields, applying the field gives rise to a spin-polarized state. Under a 4 T magnetic field that was oriented principally out of plane, a broad magnetic continuum was observed that may be consistent with a field-induced QSL. Our results indicate BaCo2(AsO4)2 is a promising QSL candidate.",

author = "Xinshu Zhang and Yuanyuan Xu and T. Halloran and Ruidan Zhong and C. Broholm and Cava, {R. J.} and N. Drichko and Armitage, {N. P.}",

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T1 - A magnetic continuum in the cobalt-based honeycomb magnet BaCo2(AsO4)2

AU - Zhang, Xinshu

AU - Xu, Yuanyuan

AU - Halloran, T.

AU - Zhong, Ruidan

AU - Broholm, C.

AU - Cava, R. J.

AU - Drichko, N.

AU - Armitage, N. P.

PY - 2023/1

Y1 - 2023/1

N2 - Quantum spin liquids (QSLs) are topologically ordered states of matter that host fractionalized excitations. A particular route towards a QSL is via strongly bond-dependent interactions on the hexagonal lattice. A number of Ru- and Ir-based candidate Kitaev QSL materials have been pursued, but all have appreciable non-Kitaev interactions. Using time-domain terahertz spectroscopy, we observed a broad magnetic continuum over a wide range of temperatures and fields in the honeycomb cobalt-based magnet BaCo2(AsO4)2, which has been proposed to be a more ideal version of a Kitaev QSL. Applying an in-plane magnetic field of ~0.5 T suppresses the magnetic order, and at higher fields, applying the field gives rise to a spin-polarized state. Under a 4 T magnetic field that was oriented principally out of plane, a broad magnetic continuum was observed that may be consistent with a field-induced QSL. Our results indicate BaCo2(AsO4)2 is a promising QSL candidate.

AB - Quantum spin liquids (QSLs) are topologically ordered states of matter that host fractionalized excitations. A particular route towards a QSL is via strongly bond-dependent interactions on the hexagonal lattice. A number of Ru- and Ir-based candidate Kitaev QSL materials have been pursued, but all have appreciable non-Kitaev interactions. Using time-domain terahertz spectroscopy, we observed a broad magnetic continuum over a wide range of temperatures and fields in the honeycomb cobalt-based magnet BaCo2(AsO4)2, which has been proposed to be a more ideal version of a Kitaev QSL. Applying an in-plane magnetic field of ~0.5 T suppresses the magnetic order, and at higher fields, applying the field gives rise to a spin-polarized state. Under a 4 T magnetic field that was oriented principally out of plane, a broad magnetic continuum was observed that may be consistent with a field-induced QSL. Our results indicate BaCo2(AsO4)2 is a promising QSL candidate.

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A magnetic continuum in the cobalt-based honeycomb magnet BaCo₂(AsO₄)₂

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