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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/14275
Title: Pulsed laser deposition growth of heteroepitaxial YBa 2Cu 3O 7/La 0.67Ca 0.33MnO 3 superlattices on NdGaO 3 and Sr 0.7La 0.3Al 0.65Ta 0.35O 3 substrates
Authors: Malik, Vivek K.
Marozau I.
Das S.
Doggett B.
Satapathy D.K.
Uribe-Laverde M.A.
Biskup N.
Varela M.
Schneider C.W.
Marcelot C.
Stahn J.
Bernhard C.
Published in: Physical Review B - Condensed Matter and Materials Physics
Abstract: Heteroepitaxial superlattices of [YBa 2Cu 3O 7(n)/La 0.67Ca 0.33MnO 3(m)] x (YBCO/LCMO), where n and m are the number of YBCO and LCMO monolayers and x the number of bilayer repetitions, have been grown with pulsed laser deposition on NdGaO 3 (110) and Sr 0.7La 0.3Al 0.65Ta 0.35O 3 (001). These substrates are well lattice matched with YBCO and LCMO and, unlike the commonly used SrTiO 3, they do not give rise to complex and uncontrolled strain effects at low temperature. The growth dynamics and the structure have been studied in situ with reflection high-energy electron diffraction and ex situ with scanning transmission electron microscopy, x-ray diffraction, and neutron reflectometry. The individual layers are found to be flat and continuous over long lateral distances with sharp and coherent interfaces and with a well-defined thickness of the individual layer. The only visible defects are antiphase boundaries in the YBCO layers that originate from perovskite unit-cell height steps at the interfaces with the LCMO layers. We also find that the first YBCO monolayer at the interface with LCMO has an unusual growth dynamics and is lacking the CuO chain layer, while the subsequent YBCO layers have the regular Y-123 structure. Accordingly, the CuO 2 bilayers at both the LCMO/YBCO and the YBCO/LCMO interfaces are lacking one of their neighboring CuO chain layers and, thus, half of their hole-doping reservoir. Nevertheless, from electric transport measurements on a superlattice with n=2 we obtain evidence that the interfacial CuO 2 bilayers remain conducting and even exhibit the onset of a superconducting transition at very low temperature. Finally, we show from dc magnetization and neutron reflectometry measurements that the LCMO layers are strongly ferromagnetic. © 2012 American Physical Society.
Citation: Physical Review B - Condensed Matter and Materials Physics (2012), 85(5): -
URI: https://doi.org/10.1103/PhysRevB.85.054514
http://repository.iitr.ac.in/handle/123456789/14275
Issue Date: 2012
ISSN: 10980121
Author Scopus IDs: 24758795000
6507638686
57202838752
57191978029
15842708300
17136224000
55905982100
35735462500
35567296000
37075198500
6602107663
16030481900
Author Affiliations: Malik, V.K., University of Fribourg, Department of Physics, Fribourg Centre for Nanomaterials, Chemin du Musée 3, CH-1700 Fribourg, Switzerland, Department of Chemical Engineering and Material Science, University of California, Davis, CA 95616, United States
Marozau, I., University of Fribourg, Department of Physics, Fribourg Centre for Nanomaterials, Chemin du Musée 3, CH-1700 Fribourg, Switzerland
Das, S., University of Fribourg, Department of Physics, Fribourg Centre for Nanomaterials, Chemin du Musée 3, CH-1700 Fribourg, Switzerland
Doggett, B., University of Fribourg, Department of Physics, Fribourg Centre for Nanomaterials, Chemin du Musée 3, CH-1700 Fribourg, Switzerland
Satapathy, D.K., University of Fribourg, Department of Physics, Fribourg Centre for Nanomaterials, Chemin du Musée 3, CH-1700 Fribourg, Switzerland
Uribe-Laverde, M.A., University of Fribourg, Department of Physics, Fribourg Centre for Nanomaterials, Chemin du Musée 3, CH-1700 Fribourg, Switzerland
Biskup, N., Universidad Complutense de Madrid, Madrid ES-28040, Spain
Varela, M., Universidad Complutense de Madrid, Madrid ES-28040, Spain, Oak Ridge National Laboratory, Oak Ridge, TN 37831, United States
Schneider, C.W., Materials Group, Paul Scherrer Institut, CH-5232 Villigen, Switzerland
Marcelot, C., Laboratory for Neutron Scattering, Paul Scherrer Institut, CH-5232 Villigen, Switzerland
Stahn, J., Laboratory for Neutron Scattering, Paul Scherrer Institut, CH-5232 Villigen, Switzerland
Bernhard, C., University of Fribourg, Department of Physics, Fribourg Centre for Nanomaterials, Chemin du Musée 3, CH-1700 Fribourg, Switzerland
Corresponding Author: Malik, V.K.; University of Fribourg, Department of Physics, Fribourg Centre for Nanomaterials, Chemin du Musée 3, CH-1700 Fribourg, Switzerland
Appears in Collections:Journal Publications [PH]

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