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Title: Efficient route to TlBa{sub 2}Ca{sub 2}Cu{sub 3}O{sub 9+x} thin films by metal-organic chemical vapor deposition using TlF as a thallination source

Abstract

Thin TlBa{sub 2}Ca{sub 2}Cu{sub 3}O{sub 9+x} films were grown on single crystal (110) LaAlO{sub 3} from metal-organic chemical-vapor deposition-derived Ba{endash}Ca{endash}Cu{endash}O{sub x} precursor films employing Ba(hfa){sub 2}{center_dot}mep, Ca(hfa){sub 2}{center_dot}tet, and Cu(dpm){sub 2} (hfa=hexafluoroacetylacetonate; dpm=dipivaloylmethanate; tet=tetraglyme; mep=methylethylpentaglyme) as the volatile metal sources. Thallination is then accomplished by annealing the precursor films in the presence of a bulk BaO+CaO+CuO+TlF source at 885{degree}C in flowing O{sub 2}. The presence of TlF is essential for nucleating the Tl-1223 phase. The resulting Tl-1223 films are nearly phase-pure, highly oriented, epitaxial by x-ray diffraction, and contain negligible fluoride by windowless energy-dispersive x-ray measurements. The films exhibit a transport measured T{sub c}=103K and J{sub c}=4.4{times}10{sup 4}A/cm{sup 2} (77 K, 0 T). Magnetic hysteresis measurements yield J{sub c}=1.9{times}10{sup 5}A/cm{sup 2} (30 K, 0.01 T) and show considerable flux pinning at low temperatures with J{sub c}=1.4{times}10{sup 5}A/cm{sup 2} (5 K, 4.5 T). {copyright} {ital 1997 American Institute of Physics.}

Authors:
; ; ; ; ; ;  [1]; ;  [2]
  1. Science and Technology Center for Superconductivity, Northwestern University, Evanston, Illinois 60208-3113 (United States)
  2. Materials Science Division, Science and Technology Center for Superconductivity, Argonne National Laboratory, Argonne, Illinois 60439 (United States)
Publication Date:
Research Org.:
ANL (Argonne National Laboratory (ANL), Argonne, IL)
Sponsoring Org.:
USDOE
OSTI Identifier:
538384
DOE Contract Number:  
W-31-109-ENG-38
Resource Type:
Journal Article
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 71; Journal Issue: 9; Other Information: PBD: Sep 1997
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; HIGH-TC SUPERCONDUCTORS; CHEMICAL VAPOR DEPOSITION; THALLIUM COMPOUNDS; BARIUM COMPOUNDS; CALCIUM COMPOUNDS; MAGNETIC SUSCEPTIBILITY; ANNEALING; MAGNETIC FLUX; THIN FILMS; THALLIUM OXIDES; BARIUM OXIDES; CALCIUM OXIDES; COPPER OXIDES; CRYSTAL STRUCTURE; X-RAY DIFFRACTION; MAGNETIZATION

Citation Formats

McNeely, R J, Belot, J A, Hinds, B J, Marks, T J, Schindler, J L, Chudzik, M P, Kannewurf, C R, Zhang, X F, and Miller, D J. Efficient route to TlBa{sub 2}Ca{sub 2}Cu{sub 3}O{sub 9+x} thin films by metal-organic chemical vapor deposition using TlF as a thallination source. United States: N. p., 1997. Web. doi:10.1063/1.119862.
McNeely, R J, Belot, J A, Hinds, B J, Marks, T J, Schindler, J L, Chudzik, M P, Kannewurf, C R, Zhang, X F, & Miller, D J. Efficient route to TlBa{sub 2}Ca{sub 2}Cu{sub 3}O{sub 9+x} thin films by metal-organic chemical vapor deposition using TlF as a thallination source. United States. doi:10.1063/1.119862.
McNeely, R J, Belot, J A, Hinds, B J, Marks, T J, Schindler, J L, Chudzik, M P, Kannewurf, C R, Zhang, X F, and Miller, D J. Mon . "Efficient route to TlBa{sub 2}Ca{sub 2}Cu{sub 3}O{sub 9+x} thin films by metal-organic chemical vapor deposition using TlF as a thallination source". United States. doi:10.1063/1.119862.
@article{osti_538384,
title = {Efficient route to TlBa{sub 2}Ca{sub 2}Cu{sub 3}O{sub 9+x} thin films by metal-organic chemical vapor deposition using TlF as a thallination source},
author = {McNeely, R J and Belot, J A and Hinds, B J and Marks, T J and Schindler, J L and Chudzik, M P and Kannewurf, C R and Zhang, X F and Miller, D J},
abstractNote = {Thin TlBa{sub 2}Ca{sub 2}Cu{sub 3}O{sub 9+x} films were grown on single crystal (110) LaAlO{sub 3} from metal-organic chemical-vapor deposition-derived Ba{endash}Ca{endash}Cu{endash}O{sub x} precursor films employing Ba(hfa){sub 2}{center_dot}mep, Ca(hfa){sub 2}{center_dot}tet, and Cu(dpm){sub 2} (hfa=hexafluoroacetylacetonate; dpm=dipivaloylmethanate; tet=tetraglyme; mep=methylethylpentaglyme) as the volatile metal sources. Thallination is then accomplished by annealing the precursor films in the presence of a bulk BaO+CaO+CuO+TlF source at 885{degree}C in flowing O{sub 2}. The presence of TlF is essential for nucleating the Tl-1223 phase. The resulting Tl-1223 films are nearly phase-pure, highly oriented, epitaxial by x-ray diffraction, and contain negligible fluoride by windowless energy-dispersive x-ray measurements. The films exhibit a transport measured T{sub c}=103K and J{sub c}=4.4{times}10{sup 4}A/cm{sup 2} (77 K, 0 T). Magnetic hysteresis measurements yield J{sub c}=1.9{times}10{sup 5}A/cm{sup 2} (30 K, 0.01 T) and show considerable flux pinning at low temperatures with J{sub c}=1.4{times}10{sup 5}A/cm{sup 2} (5 K, 4.5 T). {copyright} {ital 1997 American Institute of Physics.}},
doi = {10.1063/1.119862},
journal = {Applied Physics Letters},
number = 9,
volume = 71,
place = {United States},
year = {1997},
month = {9}
}