Magnetic Properties of New Triangular Lattice Magnets A$_4$B’B$_2$O$_{12}$*

Quasi-two dimensional (-2D) triangular lattice magnets (TLMs) may adopt a variety of intriguing ground states including a 120° planar, collinear striped, ferromagnetic, and quantum spin liquid structures. Reduction of interplane interactions can be engineered via addition of non-magnetic layers and provide a glimpse into more truly 2D behavior on a triangular lattice. Members of A$_4$B’B$_2$O$_{12}$ (A=Ba, La, Sr; B’= Co, Ni, Mn) have been synthesized and examined using x-ray diffraction, AC and DC susceptibility, specific heat, and powder neutron diffraction. The magnetic properties are examined in relation to chemical pressure and spin size. A rich phase diagram is observed for Ba$_2$La$_2$MnW$_2$O$_{12}$.