A ferromagnetic insulating (FM-I) manganite Pr0.75Ca0.25MnO3 has been studied by neutron scattering technique. In contrast to a conventional double exchange picture, Pr0.75Ca0.25MnO3 exhibits a FM-I state, and it has been demonstrated to be ascribed to an orbital ordering rather than charge ordering. The orbital ordering consists of the antiferromagnetic-type orbital ordering like LaMnO3 hybridized with orbitals along the z direction.
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