Volume 68, Number 3, November 2004
|Page(s)||453 - 459|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||13 October 2004|
Spin-polarized oxygen hole states in cation-deficient x
Institute of Materials Science, NCSR Demokritos 153 10 Aghia Paraskevi, Attiki, Greece
2 Department of Physics, University of Illinois - Urbana, IL 1801, USA
3 Institut de Physique Experimentale, EPFL-PH-Ecublens 1015-Lausanne, Switzerland
4 Josef Stefan Institute - Jamova 39, 61111 Ljubljana, Slovenia
Accepted: 15 September 2004
We report on NMR evidence about a novel effect in x systems with cation deficience. We show that in the low–-doping regime, these systems exhibit a very strong hyperfine field at certain nuclear sites, which is not present in the stoichiometric compounds. Comparison of our NMR results with recent X-ray absorption data at the K-edge, suggests the formation of a spin-polarized hole arrangement on the oxygen orbitals as the origin of this effect.
PACS: 75.47.Lx – Manganites / 76.60.-k – Nuclear magnetic resonance and relaxation / 75.47.Gk – Colossal magnetoresistance
© EDP Sciences, 2004
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