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Title: Three-Magnon Bound State in the Quasi-One-Dimensional Antiferromagnet α-NaMnO2

Journal Article · · Physical Review Letters
ORCiD logo [1];  [2];  [3]; ORCiD logo [3];  [4];  [3]; ORCiD logo [3]
  1. National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States); Univ. of California, Santa Barbara, CA (United States)
  2. Univ. of California, Santa Barbara, CA (United States); Nanyang Technological University (Singapore)
  3. Univ. of California, Santa Barbara, CA (United States)
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
+ Show Author Affiliations

Here we report on the formation of a three-magnon bound state in the quasi-one-dimensional antiferromagnet α-NaMnO2, where the single-ion, uniaxial anisotropy inherent to the Mn3+ 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, speci fically, that a weak three-magnon bound state is detected below the antiferromagnetic ordering transition of NaMnO2. We corroborate our findings with exact numerical simulations of a one-dimensional Heisenberg chain with easy-axis anisotropy using matrix-product state techniques, nding a good quantitative agreement with the experiment. Furthermore, these results establish NaMnO2 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.

Research Organization:
Univ. of California, Santa Barbara, CA (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)
Grant/Contract Number:
SC0017752; FG02-08ER46524; 1650114; AC05-00OR22725
OSTI ID:
1642907
Alternate ID(s):
OSTI ID: 1798569
Journal Information:
Physical Review Letters, Vol. 124, Issue 19; ISSN 0031-9007
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 8 works
Citation information provided by
Web of Science

References (21)

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Related Subjects

36 MATERIALS SCIENCE
Neutron scattering
Magnons
Frustrated magnetism
Composite bosons
Spin dynamics
1-dimensional spin chains
Antiferromagnets
Inelastic neutron scattering