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 journalArticlepeer-review

18 Scopus citations


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 languageEnglish (US)
Pages (from-to)58-63
Number of pages6
JournalNature Materials
Issue number1
StatePublished - 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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