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When holes are doped into a Mott-Hubbard type insulator, like lightly dopedmanganites of the La(1-x)CaxMnO3 family, the cooperative Jahn-Tellerdistortions and the appearance of orbital ordering require an arrangement ofMn(3+)/Mn(4+) for the establishment of the insulating canted antiferromagnetic(for x<=0.1), or of the insulating ferromagnetic (for 0.1<x<= 0.2) groundstate. In the present work we provide NMR evidence about a novel and at thesame time puzzling effect in La(1-x)CaxMnO(3+delta) systems with cationdeficience. We show that in the low Ca-doping regime, these systems exhibit avery strong hyperfine field at certain La nuclear sites, which is not presentin the stoichiometric compounds. Comparison of our NMR results with recentx-ray absorption data at the Mn K edge, suggests the formation of aspin-polarized hole arrangement on the 2p oxygen orbitals as the origin of thiseffect.Comment: 10 pages, 4 Figures, submitted to PR

Spin-polarized oxygen hole states in cation-deficient La 1 − x Ca x MnO 3 + δ

Spin-polarized oxygen hole states in cation-deficient La _{1 − x} Ca _x MnO _{3 + δ}