Dynamics of bound magnon pairs in the quasi-one-dimensional frustrated magnet LiCuVO4

We report on the dynamics of the spin-1/2 quasi-one-dimensional frustrated magnet LiCuVO4 measured by nuclear spin relaxation in high magnetic fields 10–34 T, in which the ground state has spin-density-wave order. The spin fluctuations in the paramagnetic phase exhibit striking anisotropy with respe...

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Bibliographic Details
Published in:Physical review. B 2017-10, Vol.96 (13)
Main Authors: Nawa, K, Takigawa, M, Krämer, S, Horvatić, M, Berthier, C, Yoshida, M, Yoshimura, K
Format: Article
Language:English
Subjects:
Anisotropy
Antiferromagnetism
Condensed Matter
Dependence
Excitation spectra
Ferromagnetism
Magnetic fields
Magnetic induction
Nuclear spin
Nuclei
Physics
Spin density waves
Spin dynamics
Strongly Correlated Electrons
Variation
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Summary:We report on the dynamics of the spin-1/2 quasi-one-dimensional frustrated magnet LiCuVO4 measured by nuclear spin relaxation in high magnetic fields 10–34 T, in which the ground state has spin-density-wave order. The spin fluctuations in the paramagnetic phase exhibit striking anisotropy with respect to the magnetic field. The transverse excitation spectrum probed by V51 nuclei has an excitation gap, which increases with field. On the other hand, the gapless longitudinal fluctuations sensed by Li7 nuclei grow with lowering temperature, but tend to be suppressed with increasing field. Such anisotropic spin dynamics and its field dependence agree with the theoretical predictions and are ascribed to the formation of bound magnon pairs, a remarkable consequence of the frustration between ferromagnetic nearest-neighbor and antiferromagnetic next-nearest-neighbor interactions.
ISSN:2469-9950
1098-0121
2469-9969
1550-235X
DOI:10.1103/PhysRevB.96.134423