Coexistence of dimerization and long-range magnetic order in the quantum antiferromagnetic compound LiCu2O2: inelastic light scattering study

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  • 19 November 2003
Abstract
Results of systematic Raman scattering studies of the frustrated spin chain system LiCu2O2 are presented. Two transitions into magnetically ordered phase (taken place at temperatures 9 K and 23 K) have been confirmed from the analysis of optical properties of the samples. Interestingly, two different magnetic excitations, seen at 100 and 110 cm$^{-1}$ superimpose each other independently, indicating a coherent coexistence of the long-range order and dimerization in the magnetically-ordered phase. The observed phenomenon is attributed to magnetostructural peculiarities of LiCu2O2 leading to the intrinsic presence of the magnetic/nonmagnetic impurities in the magnetic ordered phase on a nanometer scale. Our studies suggest that long-range AFM ordering induced by non-magnetic doping in low-dimensional materials is not restricted to a single site dopant, but can be promoted by nano-scale sized defects as well.

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