AVS 59th Annual International Symposium and Exhibition
    Oxide Heterostructures-Interface Form & Function Focus Topic Tuesday Sessions
       Session OX-TuP

Paper OX-TuP5
Effects of Nonstoichiometry on the Structure and Electronic Properties of LaCrO3 Thin Films on SrTiO3(001)

Tuesday, October 30, 2012, 6:00 pm, Room Central Hall

Session: Oxide Interfaces and Heterostructures Poster Session
Presenter: Y.G. Du, Pacific Northwest National Laboratory
Authors: K.H.L. Zhang, Pacific Northwest National Laboratory
Y.G. Du, Pacific Northwest National Laboratory
L. Qiao, Pacific Northwest National Laboratory
S.A. Chambers, Pacific Northwest National Laboratory
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The ability to precisely control the structure, stoichiometry and defect densities in epitaxial perovskite films is emerging as one of the major challenges for understanding the sometimes novel physical properties exhibited by interfaces and superlattices of these materials. Recently we have demonstrated that structurally excellent, stoichiometric LaCrO3 thin films can be grown on SrTiO3(001) by molecular beam epitaxy. In this contribution, we further explore the effects of nonstoichiometry on the structure and electronic properties of La1+xCr1-xO3 thin films with -0.13<x<0.05. Interestingly, La-deficient films maintain high crystalline quality in spite of very large deviations from stoichiometry, while La -rich films exhibit significantly degraded crystalline quality. Ongoing studies of lattice parameters, film and interface microstructures, and electronic properties will be discussed in order to elucidate different mechanisms of accommodating A-site and B-site cation imbalances during the epitaxial growth of perovskites.