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Coupling of spin and lattice modes in the S=1/2 two-dimensional antiferromagnet K2V3O8 with magneto-dielectric couplings
- Issue Date
- Apr-2012
- Publisher
- AMER PHYSICAL SOC
- Citation
- PHYSICAL REVIEW B, v.85, no.14
- Journal Title
- PHYSICAL REVIEW B
- Volume
- 85
- Number
- 14
- ISSN
- 2469-9950
2469-9969
- Abstract
- Lattice dynamics and magnetic excitations are investigated to elucidate the origin of magneto-dielectric effects in the S = 1/2 two-dimensional quantum spin compound K2V3O8. We find evidence for lattice instabilities at 110 K and 60 K as optical phonon anomalies and a soft mode at 26 cm(-1) in A(1) symmetry. Two-magnon excitations in B-1 symmetry show an unconventional double-peak structure and temperature dependence. This suggests the existence of a split mode near the zone boundary caused by a mixing of spin and lattice modes.
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