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Title: Three-magnon bound state in the quasi-one-dimensional antiferromagnet α-NaMnO2
Authors: Dally, Rebecca L.
Heng, Alvin J. R.
Keselman, Anna
Bordelon, Mitchell M.
Stone, Matthew B.
Balents, Leon
Wilson, Stephen D.
Keywords: Physics - Strongly Correlated Electrons
Physics - Strongly Correlated Electrons
Issue Date: 2020
Source: Dally, R. L., Heng, A. J. R., Keselman, A., Bordelon, M. M., Stone, M. B., Balents, L., & Wilson, S. D. (2020). Three-magnon bound state in the quasi-one-dimensional antiferromagnet α-NaMnO2. Physical Review Letters, 124(19), 197203-. doi:10.1103/PhysRevLett.124.197203
Journal: Physical Review Letters
Abstract: Here we report on the formation of a three-magnon bound state in the quasi-one-dimensional antiferromagnet α-NaMnO_{2}, where the single-ion, uniaxial anisotropy inherent to the Mn^{3+} ions in this material provides a binding mechanism capable of stabilizing higher order magnon bound states. While such states have long remained elusive in studies of antiferromagnetic chains, neutron scattering data presented here demonstrate that higher order n>2 composite magnons exist, and, specifically, that a weak three-magnon bound state is detected below the antiferromagnetic ordering transition of NaMnO_{2}. We corroborate our findings with exact numerical simulations of a one-dimensional Heisenberg chain with easy-axis anisotropy using matrix-product state techniques, finding a good quantitative agreement with the experiment. These results establish α-NaMnO_{2} as a unique platform for exploring the dynamics of composite magnon states inherent to a classical antiferromagnetic spin chain with Ising-like single ion anisotropy.
ISSN: 0031-9007
DOI: 10.1103/PhysRevLett.124.197203
Rights: © 2020 American Physical Society. All rights reserved. This paper was published in Physical Review Letters and is made available with permission of American Physical Society.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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