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Tunable Magnon Interactions in a Ferromagnetic Spin-1 Chain
Prashant Chauhan1, Fahad Mahmood1, Hitesh J Changlani1,2,3
1The Institute for Quantum Matter, Department of Physics and Astronomy, The Johns Hopkins University, Baltimore, Maryland 21218, USA.
Physical Review Letters
|February 8, 2020
Summary
Researchers studied nickel niobate (NiNb_{2}O_{6}), a unique spin-1 chain material. They discovered temperature-dependent spin excitation renormalization due to magnon-magnon interactions, tunable with magnetic fields.
Area of Science:
- Condensed Matter Physics
- Quantum Magnetism
- Materials Science
Background:
- Nickel niobate (NiNb_{2}O_{6}) serves as an exceptional model for a 1D spin-1 ferromagnetic Heisenberg chain.
- Understanding low-energy excitations and their interactions is crucial for characterizing magnetic materials.
Purpose of the Study:
- To investigate the low-energy electrodynamic response of NiNb_{2}O_{6} using time-domain THz spectroscopy.
- To explore the temperature and magnetic field dependence of spin excitations in this spin-1 system.
Main Methods:
- Time-domain THz spectroscopy was employed to measure the electrodynamic response.
- Theoretical approaches including exact diagonalizations and finite temperature dynamical Lanczos calculations were utilized.
- Experimental data was analyzed as a function of temperature and external magnetic field.
Main Results:
- A magnon-like spin excitation, representing the lowest energy excitation at q∼0, was identified at low temperatures.
- Unexpected temperature-dependent renormalization of the spin-excitation energy was observed at higher temperatures.
- This renormalization exhibited a strong dependence on the magnetic field direction.
Conclusions:
- Magnon-magnon interactions were found to be responsible for the observed spin-excitation renormalization.
- The sign of the magnon-magnon interaction can be tuned by adjusting the magnetic field's strength and direction.
- The spin-1 nature of NiNb_{2}O_{6} leads to unique phenomena not observed in spin-1/2 systems.
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