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Title: Tunable Magnon Interactions in a Ferromagnetic Spin-1 Chain

Journal Article · · Physical Review Letters
 [1];  [2];  [3];  [2];  [2]
  1. Johns Hopkins Univ., Baltimore, MD (United States); OSTI
  2. Johns Hopkins Univ., Baltimore, MD (United States)
  3. Florida State Univ., Tallahassee, FL (United States); National High Magnetic Field Lab., Tallahassee, FL (United States); Johns Hopkins Univ., Baltimore, MD (United States)
+ Show Author Affiliations

NiNb2O6 is an almost ideal realization of a 1D spin-1 ferromagnetic Heisenberg chain compound with weak unidirectional anisotropy. Using time-domain THz spectroscopy, we measure the low-energy electrodynamic response of NiNb2O6 as a function of temperature and external magnetic field. At low temperatures, we find a magnonlike spin excitation, which corresponds to the lowest energy excitation at q ~ 0. At higher temperatures, we unexpectedly observe a temperature-dependent renormalization of the spin-excitation energy, which has a strong dependence on field direction. Using theoretical arguments, exact diagonalizations, and finite temperature dynamical Lanczos calculations, we construct a picture of magnon-magnon interactions that naturally explains the observed renormalization. In this work, we show how magnetic field strength and direction may be used to directly tune the sign of the magnon-magnon interaction. This unique scenario is a consequence of the spin-1 nature and has no analog in the more widely studied spin-1/2 systems.

Research Organization:
Energy Frontier Research Centers (EFRC) (United States). Institute for Quantum Matter (IQM); Johns Hopkins Univ., Baltimore, MD (United States)
Sponsoring Organization:
National Science Foundation (NSF); State of Florida; USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0019331
OSTI ID:
1767753
Journal Information:
Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 3 Vol. 124; ISSN 0031-9007; ISSN PRLTAO
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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