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Advanced functional materials showing magnetic properties are a cornerstone of modern information technologies, and are keenly studied in order to search for useful materials within emerging technologies, such as spintronics, applied superconductivity and quantum computing. Magnetic materials containing the heavy 4d and 5d metals are relatively understudied compared to their 3d counterparts and are a promising avenue of study in this search for novel functional materials. This work presents the synthesis, structural, and magnetic characterisation of a number of novel 4d and 5d metal oxides within the BaB1-xB’xO3 perovskite, Ba3BB’2O9 6H perovskite, where B = Ti, Zn, Y, and B’ = Ru, Os. Sr2BB’O6 double perovskite, where B = Y, Mn, Fe, and B’ = Re, Os. A2-αB2O7-γ pyrochlore and defect pyrochlore, where A = Pb, Bi, Cd, Tl, and B = Mn, Ru, Ir, Os. ABO¬4 scheelite and baryte structural families, where A = K, Rb, Cs, and B = Ru, Os. These structure classes represent a wide variety of atomic connectivity and metal coordination environments, which in turn drive various magnetic coupling and exchange interactions, such as geometric frustration. The flexibility of these structural classes to composition, cation size and oxidation state, coupled with the electronic properties of the 4d and 5d metal cations gives rise to fascinating and varied magnetic behaviours, including spin ice / glass states, quantum spin liquids, quantum magnetism, antiferromagnetism, and high temperature ferrimagnetism. |
