Magnetic interactions in the S=1/2 1D spin-chain metal-organic compound Cu(N₂H₅)₂(SO₄)₂

Low dimensional 1D chains or 2D layers of magnetic ions with reduced spin offer promising routes to drive non-trivial topological and quantum behavior. Coordination polymers, or equivalently magnetic metal-organic frameworks (MOFs), with both organic and inorganic building blocks provide the ability to design these tailored structural motifs due to the versatility and predictability of organic chemistry. In this presentation we will focus on one such intriguing series of compounds M(N₂H₅)2(SO₄)₂, where M is a transition metal ion, which forms isolated 1D-spin chains. The behavior of the S=1/2 Cu compound is compared with the S=5/2 Mn material through detailed low temperature elastic and inelastic neutron measurements and analysis. These provide insights into the magnetic interactions and structure in these materials. In addition, polarized neutron diffraction measurements were utilized to determine the local susceptibility tensor in both compounds and these results will be discussed.