Abstract
We report on the magnetic susceptibility and Raman scattering measurements of theS = 1/2 three-dimensional (3D)spin web compound Cu3TeO6. The magnetic susceptibility shows an antiferromagnetic ordering atTN∼61 K and adeviation from the Curie–Weiss law around 150 K. Raman spectra show the emergence of a new mode at132 cm−1 for temperaturesbelow T*∼50 K (≈0.8 TN). At the same temperature, phonon anomalies in intensity and frequency show up. This gives evidenceof pronounced magneto-elastic effects. In addition, we observe a two-magnon Raman spectrum around214 cm−1. Compared to typical 3D spin systems, its robust temperature dependence suggests that afrustrated spin topology with a reduced spin coordination number also enhancesspin–phonon couplings.
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