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We present inelastic neutron scattering and magnetization measurements of theantiferromagnetic insulator LaMnPO that are well described by a Heisenberg spinmodel. These measurements are consistent with the presence of two-dimensionalmagnetic correlations up to a temperature T$_{max}$ $\approx$ 700 K >> T$_{N}$= 375 K, the N\'eel temperature. Optical transmission measurements show the T =300 K direct charge gap $\Delta$ = 1 eV has decreased only marginally by 500 Kand suggest it decreases by only 10% at T$_{max}$. Density functional theoryand dynamical mean field theory calculations reproduce a direct charge gap inparamagnetic LaMnPO only when a strong Hund's coupling J$_{H}$ = 0.9 eV isincluded, as well as onsite Hubbard U = 8 eV. These results show the directcharge gap in LaMnPO is rather insensitive to antiferromagnetic exchangecoupling and instead is a result of the local physics governed by U andJ$_{H}$.

Antiferromagnetic Exchange, Hund's Coupling and the Origin of the Charge Gap in LaMnPO