Spin-polarized oxygen hole states in cation-deficient$\chem{La}$$_{1-x}$$\chem{Ca}$x$\chem{MnO}$$_{3+\delta}

We report on NMR evidence about a novel effect in $\chem{La}$$_{1-x}$$\chem{Ca}$x$\chem{MnO}$$_{3+\delta}$ systems with cation deficience. We show that in the low–$\chem{Ca}$-doping regime, these systems exhibit a very strong hyperfine field at certain $\chem{La}$ nuclear sites, which is not present...

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Bibliographic Details
Published in:Europhysics letters 2004-11, Vol.68 (3), p.453-459
Main Authors: Papavassiliou, G., Pissas, M., Belesi, M., Fardis, M., Karayanni, M., Ansermet, J. P., Carlier, D., Dimitropoulos, C., Dolinsek, J.
Format: Article
Language:English
Subjects:
75.47.Gk
75.47.Lx
76.60.-k
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Summary:We report on NMR evidence about a novel effect in $\chem{La}$$_{1-x}$$\chem{Ca}$x$\chem{MnO}$$_{3+\delta}$ systems with cation deficience. We show that in the low–$\chem{Ca}$-doping regime, these systems exhibit a very strong hyperfine field at certain $\chem{La}$ nuclear sites, which is not present in the stoichiometric compounds. Comparison of our NMR results with recent X-ray absorption data at the $\chem{Mn}$ K-edge, suggests the formation of a spin-polarized hole arrangement on the $2p$ oxygen orbitals as the origin of this effect.
ISSN:0295-5075
1286-4854
DOI:10.1209/epl/i2004-10233-3