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The Mn spin correlations were studied near the O'-O phase transition at T{JT}= 750 K, up to 950 K with 17O and 139La NMR in a stoichiometric LaMnO3crystalline sample. The measured local hyperfine fields originate from theelectron density transfered from the eg- and t2g-orbitals to the 2s(O) and6s(La) orbits, respectively. By probing the oxygen nuclei, we show that thecorrelations of the Mn spins are ferromagnetic in the ab-plane and robust up toT{JT} whereas along the c-axis, they are antiferromagnetic and start to meltbelow T{JT}, at about 550 K. Above T{JT} the ferromagnetic Mn-Mn exchangeinteraction is found isotropic. The room temperature orbital mixing angle,{\phi}nmr = 109+-1.5{\deg}, of the eg ground state is close to the reportedvalue which was deduced from structural data on Jahn-Teller distorted MnO6octahedra. For T > T{JT} LaMnO3 can be described in terms of non-polarizedeg-orbitals since both eg-orbitals are equally occupied.

Melting of the orbital order in LaMnO3 probed by NMR