Magnetic Order and Frustration in Doped Sr$_{2}$Mn$_{3}$As$_{2}$O$_{2}$

Crystal structure is often key in dictating a material's magnetic and physical properties. Two components of crystal structure that can be particularly influential are reduced dimensionality (1D or 2D) or geometric frustration. The layered crystal structure of Sr$_{2}$Mn$_{3}$As$_{2}$O$_{2}$ which crystallizes in the tetragonal I4 /mmm space group, exhibits both these features. This compound is of particular interest because it consists of Fe pnictide-\textit{like} tetrahedral planes that alternate with Cu-O-\textit{like} octahedral layers. This structure is a promising avenue to study geometric effects in relation to unconventional superconductivity. Here we report a magnetic study of the effects of 3d and 4d transition metal substitutions on the Mn site, with emphasis on the resulting long range \textit{and} short range order. AC and DC magnetization data provide evidence for spin glass to cluster glass crossover with 4d metal doping, while 3d metal doping suppresses both the magnetic order and glassy state. This can be attributed to half-filled Mn 3d shells in a 2D magnetic structure as suggested by neutron diffraction data and band structure calculations.