Exotic behaviors of spin dimers in quantum ferrimagnet Cu₂Fe₂Ge₄O₁₃

From recent neutron scattering study in quantum spin systems

Abstract

Comprehensive study by neutron scattering technique in a weakly coupled quantum dimers and classical chains compound Cu₂Fe₂Ge₄O₁₃is reported. Thorough survey of the spin dynamics in four dimensional k-E space by triple axis spectrometer reveals that the dimer behaves as a media that transfers exchange integrals from one Fe spin to another. The obtained effective parameter of the indirect magnetic interaction is totally consistent with that estimated by static measurements including neutron diffraction and magnetic susceptibility measurement.