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

Abstract

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.

4 pages, 4 figures

References in corpus (1)

• Spin dynamics of the quasi two dimensional spin-1/2 quantum magnet Cs_2CuCl_4

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• Magnetic field control of ferroelectric polarization and magnetization of LiCu2O2 compound
• Determination of superexchange interactions for the CuO${}_2$ chains in LiCu${}_2$O${}_2$
• Investigation of the Structural and Dynamical Properties of the (001) Surface of LiCu2O2
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