High-resolution transmission electron microscopy study on strained epitaxial manganite thin films and heterostructures

B. Wiedenhorst, C. Höfener, Yafeng Lu, J. Klein, M. S.R. Rao, B. H. Freitag, W. Mader, L. Alff, R. Gross

Research output: Contribution to journalConference articlepeer-review

27 Scopus citations


Pulsed laser deposition has been used to grow epitaxial La2/3Sr1/3MnO3 and La2/3Ba1/3MnO3 thin films as well as La2/3Ba1/3MnO3/SrTiO3 heterostructures. The microstructure was studied by four-circle X-ray diffraction and high-resolution transmission electron microscopy. Strain effects due to lattice mismatch between substrate and film, and between different layers in the heterostructures were found to play a key role in determining the thin film properties. La2/3Ba1/3MnO3 films on SrTiO3 substrates show perfect epitaxy and grow coherently strained over the whole film thickness. In contrast, La2/3Sr1/3MnO3 films on SrTiO3 substrates were found to form two layers with different lattice parameters separated by an intrinsic interface region containing a high density of defects. La2/3Ba1/3MnO3/SrTiO3 superlattices are coherently strained and show a very low density of structural defects and sharp interfaces. The observed interface roughness was below 1 nm allowing the controlled growth of continuous two unit-cell thick La2/3Ba1/3MnO3 layers. We also discuss the influence of strain on the electrical transport properties.

Original languageEnglish
Pages (from-to)16-21
Number of pages6
JournalJournal of Magnetism and Magnetic Materials
Issue number1
StatePublished - 1 Mar 2000
Externally publishedYes
EventE-MRS Spring Meeting 1999 - Symposium G: Material Physics Issues and Applications of Magnetic Oxides - Strasbourg, France
Duration: 1 Jun 19994 Jun 1999


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