$J_1$-$J_2$ square lattice antiferromagnetism in the orbitally quenched insulator MoOPO${}_4$

L. Yang, M. Jeong, P. Babkevich +12

We report magnetic and thermodynamic properties of a $4d^1$ (Mo${}^{5+}$) magnetic insulator MoOPO${}_4$ single crystal, which realizes a $J_1$-$J_2$ Heisenberg spin-$1/2$ model on a s…