Effects of oxygen-reducing atmosphere annealing on LaMnO$_3$ epitaxial thin films

Details Effects of oxygen-reducing atmosphere annealing on LaMnO$_3$ epitaxial thin films Effects of oxygen-reducing atmosphere annealing on LaMnO$_3$ epitaxial thin films

2009-07-13

arxiv.org/abs/0907.2125v1

Journal of Physics D: Applied Physics Volume 42, Number 16, 165401 (2009)

Physics

Condensed Matter

Strongly Correlated Electrons

10 pages including 3 figures, accepted in J. Phys. D: Appl. Phys

Scientific paper

10.1088/0022-3727/42/16/165401

We investigated the effects of annealing on LaMnO$_3$ epitaxial thin films grown by pulsed laser deposition and propose an efficient method of characterizing their stoichiometry. Structural, magnetic, and optical properties coherently indicate non-stoichiometric ferromagnetic and semiconducting phases for as-grown LaMnO$_3$ films. By annealing in an oxygen-reducing atmosphere, we recovered the antiferromagnetic and insulating phases of bulk-like stoichiometric LaMnO$_3$. We show that non-destructive optical spectroscopy at room temperature is one of the most convenient tools for identifying the phases of LaMnO$_3$ films. Our results serve as a prerequisite in studying LaMnO$_3$ based heterostructures grown by pulsed laser deposition.

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