Spin-polarized oxygen hole states in cation-deficient La 1-xCaxMnO3+δ

We report on NMR evidence about a novel effect in La1-xCa xMnO3+δ systems with cation deficience. We show that in the low-Ca-doping regime, these systems exhibit a very strong hyperfine field at certain La nuclear sites, which is not present in the stoichiometric compounds. Comparison of our NMR results with recent X-ray absorption data at the Mn K-edge, suggests the formation of a spin-polarized hole arrangement on the 2p oxygen orbitals as the origin of this effect.


Published in:
Europhysics Letters, 68, 3, 453-459
Year:
2004
Publisher:
EDP Sciences
ISSN:
02955075
Laboratories:




 Record created 2010-03-23, last modified 2018-01-28


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