Magnetic interactions in the one-dimensional spin-chain metal-organic compounds M(N2H5)2(SO4)2 (M=Cu, Co, Mn)

Abstract

Materials with one-dimensional (1D) chains of magnetic ions with reduced spin provide a platform for enhanced quantum behavior. Coordination polymers, or equivalently magnetic metal-organic frameworks (MOFs), with both organic and inorganic building blocks offer the ability to design these tailored structural motifs due to the versatility and predictability of organic chemistry. Here we focus on a series of compounds $M{({\mathrm{N}}_{2}{\mathrm{H}}_{5})}_{2}{({\mathrm{SO}}_{4})}_{2}$, where $M$ is the transition metal ion ${\mathrm{Cu}}^{2+}$, ${\mathrm{Co}}^{2+}$, or ${\mathrm{Mn}}^{2+}$, that forms isolated 1D spin chains within the bulk crystalline lattice. The behavior of the S = 1/2 Cu compound is compared with higher spin Mn and Co based materials through low temperature elastic and inelastic neutron scattering measurements. These provide insights into the magnetic interactions and structure in these materials. In addition, polarized neutron powder diffraction measurements were utilized to determine the site susceptibility tensor in all compounds that provides further insight into the magnetic interactions.