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Raman scattering measurements of the spin ladder compound (C5H12N)2CuBr4

We report Raman scattering measurements on the spin ladder compound (C5H12N)2CuBr4. Pronounced multiphonon scattering is observed up to eighth-order, arising from the Franck–Condon process. Furthermore, a two-magnon continuum is seen with frequencies around 18 cm−1 at low temperatures. Its symmetric line shape suggests a substantial hopping of triplets along the leg of the ladder. Thus, the studied system is considered to represent a two-leg ladder with coupling constants in the intermediate regime between the strong and the isotropic limit.