The development of in-plane orbital ordering with oxygen deficiency is investigated in epitaxially strained thin films of La0.7Sr0.3MnO3-delta grown under in-plane tensile strain on SrTiO3 substrates. The orbital character of 3d states is directly probed by linear dichroism in X-ray absorption spectroscopy at the Mn L-2,L-3 and O K edges. The electrical transport measurements show a rapid decrease of the metal-insulator transition temperature and an increase of the polaronic activation energy when reducing the oxygen content. The diffraction measurements show a contraction of the average out-of-plane lattice parameter due to an enhancement of the regular distribution of the Mn3+ distorted octahedra in oxygen-deficient films. We show that the oxygen deficiency and the in-plane tensile strain cooperate to stabilize the in-plane orbital occupation: the oxygen deficiency is responsible for the increased number of Jahn-Teller distorted octahedra and the in-plane tensile strain drives the arrangement of such octahedra, favoring the in-plane confinement of the e(g) orbitals. Linear dichroism in X-ray absorption also demonstrates that the Mn 3d/O 2p hybridization changes little with the oxygen content, thus confirming that the in-plane orbital ordering is the main factor influencing the transport properties. Copyright (C) EPLA, 2007

Aruta, C., Balestrino, G., Tebano, A., Ghiringhelli, G., & Brookes, N. (2007). Cooperative enhancement of in-plane orbital ordering by oxygen deficiency and in-plane tensile strain in La0.7Sr0.3MnO3-delta thin films. EUROPHYSICS LETTERS, 80(3) [10.1209/0295-5075/80/37003].

Cooperative enhancement of in-plane orbital ordering by oxygen deficiency and in-plane tensile strain in La0.7Sr0.3MnO3-delta thin films

ARUTA, CARMELA;BALESTRINO, GIUSEPPE;TEBANO, ANTONELLO;
2007

Abstract

The development of in-plane orbital ordering with oxygen deficiency is investigated in epitaxially strained thin films of La0.7Sr0.3MnO3-delta grown under in-plane tensile strain on SrTiO3 substrates. The orbital character of 3d states is directly probed by linear dichroism in X-ray absorption spectroscopy at the Mn L-2,L-3 and O K edges. The electrical transport measurements show a rapid decrease of the metal-insulator transition temperature and an increase of the polaronic activation energy when reducing the oxygen content. The diffraction measurements show a contraction of the average out-of-plane lattice parameter due to an enhancement of the regular distribution of the Mn3+ distorted octahedra in oxygen-deficient films. We show that the oxygen deficiency and the in-plane tensile strain cooperate to stabilize the in-plane orbital occupation: the oxygen deficiency is responsible for the increased number of Jahn-Teller distorted octahedra and the in-plane tensile strain drives the arrangement of such octahedra, favoring the in-plane confinement of the e(g) orbitals. Linear dichroism in X-ray absorption also demonstrates that the Mn 3d/O 2p hybridization changes little with the oxygen content, thus confirming that the in-plane orbital ordering is the main factor influencing the transport properties. Copyright (C) EPLA, 2007
Pubblicato
Rilevanza internazionale
Articolo
Esperti anonimi
Settore FIS/03 - Fisica della Materia
English
Aruta, C., Balestrino, G., Tebano, A., Ghiringhelli, G., & Brookes, N. (2007). Cooperative enhancement of in-plane orbital ordering by oxygen deficiency and in-plane tensile strain in La0.7Sr0.3MnO3-delta thin films. EUROPHYSICS LETTERS, 80(3) [10.1209/0295-5075/80/37003].
Aruta, C; Balestrino, G; Tebano, A; Ghiringhelli, G; Brookes, N
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/99193
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