Growth of Ba_2CoWO_6 Single Crystals and their Magnetic, Thermodynamic and Electronic Properties.

This study explores the bulk crystal growth, structural characterization, and physical property measurements of the cubic double perovskite Ba₂CoWO₆ (BCWO). In BCWO, Co²⁺ ions form a face-centered cubic (FCC) lattice with non-distorted cobalt octahedra. The compound exhibits long-range antiferromagnetic order below T_N = 14 K. A slight anisotropy in the magnetization data is observed, along with a spin-flop transition at 10 kOe , a saturation field of 310 kOe at 1.6 K, and an ordered moment of 2.17 µB. Heat capacity measurements indicate an effective j = 1/2 ground state configuration, resulting from the combined effects of the crystal electric field and spin-orbit interaction. Optical property analysis reveals two gaps in the UV-Visible region, suggesting potential applications in photocatalysis and photovoltaics. The magnetic and optical properties highlight the significant role of orbital contributions within BCWO, indicating various other potential applications.