Transmission electron microscopic characterization of metal-organic chemical vapor deposition-derived superconducting Tl2Ba2Ca1Cu2Oχ thin films on Au substrates. Evidence for Au-Cu alloy formation and texturing on a nonplanar metal substrate

Jieguang Hu; Dean J. Miller; Douglas L. Schulz; Bin Han; Deborah A. Neumayer; Bruce J. Hinds; Tobin J. Marks

doi:10.1016/0921-4534(93)90012-F

Transmission electron microscopic characterization of metal-organic chemical vapor deposition-derived superconducting Tl₂Ba₂Ca₁Cu₂O_χ thin films on Au substrates. Evidence for Au-Cu alloy formation and texturing on a nonplanar metal substrate

Jieguang Hu, Dean J. Miller, Douglas L. Schulz, Bin Han, Deborah A. Neumayer, Bruce J. Hinds, Tobin J. Marks

Northwestern University

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

6 Citations (Scopus)

Abstract

The microstructure of superconducting Tl₂Ba₂Ca₁Cu₂O_χ thin films grown on Au substrates by metal-organic chemical vapor deposition (MOCVD) has been investigated. Characterization techniques included X-ray diffraction, variable temperature magnetization, scanning and transmission electron microscopy (SEM and TEM, respectively) and energy dispersive X-ray spectroscopy (EDX) measurements. The films exhibit a magnetically derived T_c≈80 K and a high degree of texturing with the crystallite c-axis oriented perpendicular to the Au substrate surface as evidenced by enhanced (00l) X-ray diffraction reflections. SEM/ EDX and TEM/EDX provide evidence of Au-Cu alloy formation but no Au diffusion into the film. The superconducting grains exhibit good compositional uniformity and excellent alignment with the substrate, even though the Au substrates were not smooth and exhibited a moderate density of steps.

Original language	English
Pages (from-to)	97-105
Number of pages	9
Journal	Physica C: Superconductivity and its applications
Volume	210
Issue number	1-2
DOIs	https://doi.org/10.1016/0921-4534(93)90012-F
Publication status	Published - May 15 1993

ASJC Scopus subject areas

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

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Hu, J., Miller, D. J., Schulz, D. L., Han, B., Neumayer, D. A., Hinds, B. J., & Marks, T. J. (1993). Transmission electron microscopic characterization of metal-organic chemical vapor deposition-derived superconducting Tl₂Ba₂Ca₁Cu₂O_χ thin films on Au substrates. Evidence for Au-Cu alloy formation and texturing on a nonplanar metal substrate. Physica C: Superconductivity and its applications, 210(1-2), 97-105. https://doi.org/10.1016/0921-4534(93)90012-F

Transmission electron microscopic characterization of metal-organic chemical vapor deposition-derived superconducting Tl₂Ba₂Ca₁Cu₂O_χ thin films on Au substrates. Evidence for Au-Cu alloy formation and texturing on a nonplanar metal substrate. / Hu, Jieguang; Miller, Dean J.; Schulz, Douglas L.; Han, Bin; Neumayer, Deborah A.; Hinds, Bruce J.; Marks, Tobin J.

In: Physica C: Superconductivity and its applications, Vol. 210, No. 1-2, 15.05.1993, p. 97-105.

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

Hu, J, Miller, DJ, Schulz, DL, Han, B, Neumayer, DA, Hinds, BJ & Marks, TJ 1993, 'Transmission electron microscopic characterization of metal-organic chemical vapor deposition-derived superconducting Tl₂Ba₂Ca₁Cu₂O_χ thin films on Au substrates. Evidence for Au-Cu alloy formation and texturing on a nonplanar metal substrate', Physica C: Superconductivity and its applications, vol. 210, no. 1-2, pp. 97-105. https://doi.org/10.1016/0921-4534(93)90012-F

Hu J, Miller DJ, Schulz DL, Han B, Neumayer DA, Hinds BJ et al. Transmission electron microscopic characterization of metal-organic chemical vapor deposition-derived superconducting Tl₂Ba₂Ca₁Cu₂O_χ thin films on Au substrates. Evidence for Au-Cu alloy formation and texturing on a nonplanar metal substrate. Physica C: Superconductivity and its applications. 1993 May 15;210(1-2):97-105. https://doi.org/10.1016/0921-4534(93)90012-F

Hu, Jieguang ; Miller, Dean J. ; Schulz, Douglas L. ; Han, Bin ; Neumayer, Deborah A. ; Hinds, Bruce J. ; Marks, Tobin J. / Transmission electron microscopic characterization of metal-organic chemical vapor deposition-derived superconducting Tl₂Ba₂Ca₁Cu₂O_χ thin films on Au substrates. Evidence for Au-Cu alloy formation and texturing on a nonplanar metal substrate. In: Physica C: Superconductivity and its applications. 1993 ; Vol. 210, No. 1-2. pp. 97-105.

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abstract = "The microstructure of superconducting Tl2Ba2Ca1Cu2Oχ thin films grown on Au substrates by metal-organic chemical vapor deposition (MOCVD) has been investigated. Characterization techniques included X-ray diffraction, variable temperature magnetization, scanning and transmission electron microscopy (SEM and TEM, respectively) and energy dispersive X-ray spectroscopy (EDX) measurements. The films exhibit a magnetically derived Tc≈80 K and a high degree of texturing with the crystallite c-axis oriented perpendicular to the Au substrate surface as evidenced by enhanced (00l) X-ray diffraction reflections. SEM/ EDX and TEM/EDX provide evidence of Au-Cu alloy formation but no Au diffusion into the film. The superconducting grains exhibit good compositional uniformity and excellent alignment with the substrate, even though the Au substrates were not smooth and exhibited a moderate density of steps.",

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