New structural aspects of Tl2Ba2CaCu2Oy epitaxial thin films grown by MOCVD on LaAlO3

X. F. Zhang; Y. S. Sung; D. J. Miller; B. J. Hinds; R. J. McNeely; D. L. Studebaker; T. J. Marks

doi:10.1016/S0921-4534(96)00695-8

New structural aspects of Tl₂Ba₂CaCu₂O_y epitaxial thin films grown by MOCVD on LaAlO₃

X. F. Zhang^*, Y. S. Sung, D. J. Miller, B. J. Hinds, R. J. McNeely, D. L. Studebaker, T. J. Marks

^*Corresponding author for this work

Chemistry

Research output: Contribution to journal › Article › peer-review

8 Scopus citations

Abstract

The microstructure of a Tl₂Ba₂CaCu₂O_y (Tl-2212) superconducting thin film grown by metal-organic chemical vapor deposition (MOCVD) on a pseudo-cubic (001) LaAlO₃ substrate has been examined by analytical transmission electron microscopy (TEM) and high-resolution electron microscopy (HREM). Over large regions, the film is epitaxial and Tl-2212 phase is found to be the major phase. The film/substrate interface is abrupt and smooth on the atomic scale but a strain-field is induced by the lattice mismatch between the film and the substrate. In addition to the intrinsic modulation structure of the Tl-2212 phase, a very different modulation structure has also been found. The space group for the Tl-2212 phase in this thin film was determined to be I4mm rather than I4/mmm as usually reported. The loss of the (001) mirror plane is attributed to a defective Tl-2212 structure in which a considerable amount of Tl vacancies and Tl disorder occurred inhomogeneously in Tl-O layers. The reason for the Tl-deficiency is discussed.

Original language	English (US)
Pages (from-to)	146-154
Number of pages	9
Journal	Physica C: Superconductivity and its applications
Volume	275
Issue number	1-2
DOIs	https://doi.org/10.1016/S0921-4534(96)00695-8
State	Published - Feb 10 1997

Keywords

Microstructure
TlBaCaCuO superconducting thin film

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Energy Engineering and Power Technology
Electrical and Electronic Engineering

Access to Document

10.1016/S0921-4534(96)00695-8

Cite this

@article{012f8f2a10d94d02814622db8a54558a,

title = "New structural aspects of Tl2Ba2CaCu2Oy epitaxial thin films grown by MOCVD on LaAlO3",

abstract = "The microstructure of a Tl2Ba2CaCu2Oy (Tl-2212) superconducting thin film grown by metal-organic chemical vapor deposition (MOCVD) on a pseudo-cubic (001) LaAlO3 substrate has been examined by analytical transmission electron microscopy (TEM) and high-resolution electron microscopy (HREM). Over large regions, the film is epitaxial and Tl-2212 phase is found to be the major phase. The film/substrate interface is abrupt and smooth on the atomic scale but a strain-field is induced by the lattice mismatch between the film and the substrate. In addition to the intrinsic modulation structure of the Tl-2212 phase, a very different modulation structure has also been found. The space group for the Tl-2212 phase in this thin film was determined to be I4mm rather than I4/mmm as usually reported. The loss of the (001) mirror plane is attributed to a defective Tl-2212 structure in which a considerable amount of Tl vacancies and Tl disorder occurred inhomogeneously in Tl-O layers. The reason for the Tl-deficiency is discussed.",

keywords = "Microstructure, TlBaCaCuO superconducting thin film",

author = "Zhang, {X. F.} and Sung, {Y. S.} and Miller, {D. J.} and Hinds, {B. J.} and McNeely, {R. J.} and Studebaker, {D. L.} and Marks, {T. J.}",

note = "Funding Information: This work was partially supported by the National Science Foundation Office of Science and Technology Centers under contract DMR 91-20(O and the US Department of Energy, Basic Energy Science-Material Science, Conservation and Renewable Energy - Advanced Utility Concepts - Superconducting Technology Program, under contract #W-31-109-ENG-38.",

year = "1997",

month = feb,

day = "10",

doi = "10.1016/S0921-4534(96)00695-8",

language = "English (US)",

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pages = "146--154",

journal = "Physica C: Superconductivity and its applications",

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TY - JOUR

T1 - New structural aspects of Tl2Ba2CaCu2Oy epitaxial thin films grown by MOCVD on LaAlO3

AU - Zhang, X. F.

AU - Sung, Y. S.

AU - Miller, D. J.

AU - Hinds, B. J.

AU - McNeely, R. J.

AU - Studebaker, D. L.

AU - Marks, T. J.

N1 - Funding Information: This work was partially supported by the National Science Foundation Office of Science and Technology Centers under contract DMR 91-20(O and the US Department of Energy, Basic Energy Science-Material Science, Conservation and Renewable Energy - Advanced Utility Concepts - Superconducting Technology Program, under contract #W-31-109-ENG-38.

PY - 1997/2/10

Y1 - 1997/2/10

N2 - The microstructure of a Tl2Ba2CaCu2Oy (Tl-2212) superconducting thin film grown by metal-organic chemical vapor deposition (MOCVD) on a pseudo-cubic (001) LaAlO3 substrate has been examined by analytical transmission electron microscopy (TEM) and high-resolution electron microscopy (HREM). Over large regions, the film is epitaxial and Tl-2212 phase is found to be the major phase. The film/substrate interface is abrupt and smooth on the atomic scale but a strain-field is induced by the lattice mismatch between the film and the substrate. In addition to the intrinsic modulation structure of the Tl-2212 phase, a very different modulation structure has also been found. The space group for the Tl-2212 phase in this thin film was determined to be I4mm rather than I4/mmm as usually reported. The loss of the (001) mirror plane is attributed to a defective Tl-2212 structure in which a considerable amount of Tl vacancies and Tl disorder occurred inhomogeneously in Tl-O layers. The reason for the Tl-deficiency is discussed.

AB - The microstructure of a Tl2Ba2CaCu2Oy (Tl-2212) superconducting thin film grown by metal-organic chemical vapor deposition (MOCVD) on a pseudo-cubic (001) LaAlO3 substrate has been examined by analytical transmission electron microscopy (TEM) and high-resolution electron microscopy (HREM). Over large regions, the film is epitaxial and Tl-2212 phase is found to be the major phase. The film/substrate interface is abrupt and smooth on the atomic scale but a strain-field is induced by the lattice mismatch between the film and the substrate. In addition to the intrinsic modulation structure of the Tl-2212 phase, a very different modulation structure has also been found. The space group for the Tl-2212 phase in this thin film was determined to be I4mm rather than I4/mmm as usually reported. The loss of the (001) mirror plane is attributed to a defective Tl-2212 structure in which a considerable amount of Tl vacancies and Tl disorder occurred inhomogeneously in Tl-O layers. The reason for the Tl-deficiency is discussed.

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