Spin dimers under staggered and random field in Cu${}_2$Fe${}_2$Ge${}_4$O$_{13}

T. Masuda, K. Kakurai, A. Zheludev

We study $S=1/2$ dimer excitation in a coupled chain and dimer compound Cu${}_2$Fe${}_2$Ge${}_4$O$_{13} by inelastic neutron scattering technique. The Zeeman split of the dimer triplet b…