Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2003-11-19
Physics
Condensed Matter
Strongly Correlated Electrons
5 pages, 4 figures. submitted to PRB; Manuscript is improved
Scientific paper
10.1103/PhysRevB.69.104421
Raman scattering studies of the frustrated spin chain system LiCu$_{2}$O$_{2}$ are reported. Two transitions into a magnetically ordered phase (taken place at temperatures $\sim$ 9 K and $\sim$ 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$^{-1}$ 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 LiCu$_{2}$O$_{2}$ 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.
Cao Gang
Choi Ki-Young
Lemmens Peter
Zvyagin Sergey A.
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