Temporal and field evolution of spin excitations in the disorder-free triangular antiferromagnet Na2BaCo(PO4)2

S. Lee, C. H. Lee, A. Berlie, A. D. Hillier, Devashibhai T. Adroja, Ruidan Zhong, R. J. Cava, Z. H. Jang, K. Y. Choi

Research output: Contribution to journalArticlepeer-review

Abstract

The realization of quantum spin liquids on a triangular lattice magnet remains challenging due to quenched disorders present in real materials. Here, we report local-probe signatures of spin-liquid-like excitations in the structurally perfect triangular antiferromagnet Na2BaCo(PO4)2. Our zero-field and longitudinal-field muon spin relaxation measurements reveal both spatially and temporally correlated spins with no hint of static magnetism down to 80 mK, consistent with a quantum spin liquid. Comprehensive Na23 nuclear magnetic resonance experiments enable us to identify a field-induced crossover of magnetic excitations from a spinonlike to a gapped magnon at the critical field μ0HC=1.65 T. Our findings uncover the temporal, thermal, and magnetic-field characteristics of the magnetic excitations in the triangular-lattice quantum spin liquid candidate Na2BaCo(PO4)2.

Original languageEnglish (US)
Article number024413
JournalPhysical Review B
Volume103
Issue number2
DOIs
StatePublished - Jan 11 2021

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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