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Magnons and electromagnons in a spin-lattice-coupled frustrated magnet CuFeO2 as seen via inelastic neutron scattering.
- Source :
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Physical Review B: Condensed Matter & Materials Physics . Nov2011, Vol. 84 Issue 18, p184401-1-184401-7. 7p. - Publication Year :
- 2011
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Abstract
- We have investigated spin-wave excitations in a four-sublattice (4SL) magnetic ground state of a frustrated magnet CuFeO2, in which "electromagnon" (electric-field-active magnon) excitation has been discovered by recent terahertz time-domain spectroscopy [Seki et al., Phys. Rev. Lett. 105, 097207 (2010)]. In a previous study, we identified two spin-wave branches in the 4SL phase by means of inelastic neutron scattering measurements under applied uniaxial pressure [T. Nakajima et al., J. Phys. Soc. Jpn. 80, 014714 (2011)]. In the present study, we have performed high-energy-resolution inelastic neutron-scattering measurements in the 4SL phase, resolving fine structures of the lower-energy spin-wave branch near the zone center. Taking account of the spin-driven lattice distortions in the 4SL phase, we have developed a model Hamiltonian to describe the spin-wave excitations. The determined Hamiltonian parameters have successfully reproduced the spin-wave dispersion relations and intensity maps obtained in the inelastic neutron-scattering measurements. The results of the spin-wave analysis have also revealed physical pictures of the magnon and electromagnon modes in the 4SL phase, suggesting that collinear and noncollinear characters of the two spin-wave modes are the keys to understanding the dynamical coupling between the spins and electric dipole moments in this system. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 10980121
- Volume :
- 84
- Issue :
- 18
- Database :
- Academic Search Index
- Journal :
- Physical Review B: Condensed Matter & Materials Physics
- Publication Type :
- Academic Journal
- Accession number :
- 70482676
- Full Text :
- https://doi.org/10.1103/PhysRevB.84.184401