Spin-polarized oxygen hole states in cation-deficient x

G. Papavassiliou; M. Pissas; M. Belesi; M. Fardis; M. Karayanni; J. P. Ansermet; D. Carlier; C. Dimitropoulos; J. Dolinsek

doi:10.1209/epl/i2004-10233-3

All issues

Volume 68 / No 3 (November 2004)

Europhys. Lett., 68 3 (2004) 453-459

Abstract

Issue		Europhys. Lett. Volume 68, Number 3, November 2004


Page(s)		453 - 459
Section		Condensed matter: electronic structure, electrical, magnetic, and optical properties
DOI		https://doi.org/10.1209/epl/i2004-10233-3
Published online		13 October 2004

Europhys. Lett., 68 (3), pp. 453-459 (2004)

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

G. Papavassiliou¹, M. Pissas¹, M. Belesi¹, M. Fardis¹, M. Karayanni¹, J. P. Ansermet²^,3, D. Carlier³, C. Dimitropoulos³ and J. Dolinsek⁴

¹ 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

Received: 12 May 2004
Accepted: 15 September 2004

Abstract

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.

PACS: 75.47.Lx – Manganites / 76.60.-k – Nuclear magnetic resonance and relaxation / 75.47.Gk – Colossal magnetoresistance

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