Doped holes and Mn valence in manganites: a polarized soft x-ray absorption study of LaMnO3 and quasi-2D manganite systems (Articolo in rivista)

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  • Doped holes and Mn valence in manganites: a polarized soft x-ray absorption study of LaMnO3 and quasi-2D manganite systems (Articolo in rivista) (literal)
Anno
  • 2008-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1088/0953-8984/20/5/055215 (literal)
Alternative label
  • Garg, KB; Saini, NL; Sekhar, BR; Singhal, RK; Doyle, B; Nannarone, S; Bondino, F; Magnano, E; Carleschi, E; Chatterji, T (2008)
    Doped holes and Mn valence in manganites: a polarized soft x-ray absorption study of LaMnO3 and quasi-2D manganite systems
    in Journal of physics. Condensed matter (Print)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Garg, KB; Saini, NL; Sekhar, BR; Singhal, RK; Doyle, B; Nannarone, S; Bondino, F; Magnano, E; Carleschi, E; Chatterji, T (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 20 (literal)
Rivista
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Department of Physics, University of Rajasthan, Jaipur-302004, India Dipartimento di Fisica, Universit`a di Roma 'La Sapienza', Piazzale Aldo Moro 2, 00185 Roma, Italy Institute of Physics, Sachivalaya Marg, Bhubaneswar-751005, India Laboratorio Nazionale TASC, INFM-CNR, S. S. 14, km 163.5, Area Science Park, 34012 Basovizza (TS), Italy Dipartimento di Ingegneria dei Materiali e dell'Ambiente, Universit`a di Modena e Reggio Emilia, Via Vignolese 905, 41100 Modena, Italy CNR--Laboratorio Nazionale TASC-INFM, Area Science Park--Basovizza, Edificio MM--S. S. 14 km 163,5, I-34012 Basovizza (TS), Italy Science Division, Institut Laue-Langevin, BP 156, 38042 Grenoble Cedex 9, France (literal)
Titolo
  • Doped holes and Mn valence in manganites: a polarized soft x-ray absorption study of LaMnO3 and quasi-2D manganite systems (literal)
Abstract
  • The question of Mn valence and symmetry and population of doped holes in La1.2Sr1.65Ca0.15Mn2O7 and LaSr2Mn2O7 bilayer single crystals has been studied with polarized soft x-ray absorption spectroscopy. The observed changes in the O K and Mn L spectra with polarization provide a strong indication for the existence of a competition between the charge dynamics and the lattice distortion that leads to transfer of some of the holes doped in the out-of-plane (3z(2)-r(2)) states to the in-plane (x(2)-y(2)) states. The changes observed in these with doping are shown not due to a decrease in the electron population in the d(x2-y2) states but caused by an increase in density of holes in the d(z2-x2) and d(z2-y2) states, and the electrons predominantly occupy the corresponding orthogonal states, i.e., d(3x2-r2) and d(3y2-r2). No evidence is found for the existence of a formal Mn4+ valence state in these systems. (literal)
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