Magnetic Order in Tetrazolate Kagomé-like Frameworks

Materials with highly frustrated magnetic interactions can host novel states. There are, however, few known hosts for frustrated magnetism, such as the corner-sharing triangular kagome lattice. Metal-organic frameworks (MOFs), built from metal nodes linked by organic linkers, have high structural flexibility so exploration of these should be ideal for uncovering new candidates. Recently high magnetic frustration has been proposed to arise from a kagome lattice in copper and cobalt tetrazolate MOFs. Closer examination of these MOFs suggest, however, that the kagome lattice is one of two interwoven magnetic sublattices and it is unclear how their magnetic frustration is effected by coupling between these. We will determine the ordered magnetic structures of these MOFs and probe for short range order at higher temperatures to establish the origin of their frustrated magnetic interactions.