Large orbital moment and spin-orbit enabled Mott transition in the Ising Fe honeycomb lattice BaFe2(PO4)2

Young-Joon Song, K. -W. Lee, W. E. Pickett

BaFe2(PO4)2 is an unusual Ising insulating ferromagnet based on the Fe${}^{2+}$ spin $S$ = 2 ion, the susceptibility of which suggests a large orbital component to the Fe local momen…