19 research outputs found
Coexistence of dimerization and long-range magnetic order in the quantum antiferromagnetic compound LiCu2O2: inelastic light scattering study
Raman scattering studies of the frustrated spin chain system
LiCuO are reported. Two transitions into a magnetically ordered
phase (taken place at temperatures 9 K and 24 K) have been
confirmed from the analysis of optical properties of the samples.
Interestingly, two different magnetic excitations, seen at 100 and 110
cm in the magnetically ordered phase superimpose each other
independently, indicating a coherent coexistence of long-range magnetic order
and dimerization. The observed phenomenon is attributed to magnetostructural
peculiarities of LiCuO leading to the intrinsic presence of
nonmagnetic impurities on a nanometer scale. Furthermore, magnetic impurities
play a significant role in driving the transition from an incommensurate state
to a N\'{e}el ordered one at 9 K.Comment: 5 pages, 4 figures. submitted to PRB; Manuscript is improve