Anomalous frequency and intensity scaling of collective and local modes in a coupled spin tetrahedron system

Kwang-Yong Choi, Hiroyuki Nojiri, Naresh S. Dalal +3

We report on the magnetic excitation spectrum of the coupled spin tetrahedral system Cu${}_2$Te${}_2$O${}_5$Cl${}_2$ using Raman scattering on single crystals. The transition to an…