Spin-lattice interaction in the quasi one-dimensional helimagnet LiCu_2O_2

Details Spin-lattice interaction in the quasi one-dimensional helimagnet LiCu_2O_2 Spin-lattice interaction in the quasi one-dimensional helimagnet LiCu_2O_2

2006-01-31

arxiv.org/abs/cond-mat/0601701v1

Phys. Rev. Lett. 97, 067206 (2006)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.97.067206

The field dependence of the electron spin resonance in a helimagnet, LiCu_2O_2, was investigated for the first time. In the paramagnetic state a broad resonance line was observed corresponding to a g-factor of 2.3. In the critical regime around the paramagnetic to helimagnetic phase transition the resonance broadens and shifts to higher frequencies. A narrow signal is recovered at low temperature, corresponding to a spin gap of 1.5 meV in zero field. A comprehensive model of the magnons is presented, using exchange parameters from neutron scattering (T. Masuda et al, Phys. Rev. B 72, 014405), and the spin anisotropy determined here. The role of the quantum fluctuations is discussed.

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