Spin-orbital order and excitations in $3d^4$, $4d^4$, and $5d^4$ systems: Application to $\mathrm{BaFe}{\mathrm{O}}_3$, $\mathrm{S}{\mathrm{r}}_2\mathrm{Ru}{\mathrm{O}}_4$, $\mathrm{S}{\mathrm{r}}_2\mathrm{YIr}{\mathrm{O}}_6$, and ${\mathrm{K}}_2\mathrm{OsC}{\mathrm{l}}_{6}4$

Shahid Ahmad, Harshvardhan Parmar, Shubhajyoti Mohapatra +1

Evolution of composite spin-orbital order and coupled spin-orbital excitations is studied in a variety of $d^4$ systems with $n$=$4$ electrons in the $t_{2g}$ orbital sector using…