Thermodynamics and thin film deposition of MgB2 superconductors

X. X. Xi; X. H. Zeng; A. Soukiassian; J. Jones; J. Hotchkiss; Yu Zhong; C. O. Brubaker; Zi Kui Liu; J. Lettieri; D. G. Schlom; Y. F. Hu; E. Wertz; Qi Li; W. Tian; H. P. Sun; X. Q. Pan

doi:10.1088/0953-2048/15/3/333

Thermodynamics and thin film deposition of MgB₂ superconductors

X. X. Xi, X. H. Zeng, A. Soukiassian, J. Jones, J. Hotchkiss, Yu Zhong, C. O. Brubaker, Zi Kui Liu, J. Lettieri, D. G. Schlom, Y. F. Hu, E. Wertz, Qi Li, W. Tian, H. P. Sun, X. Q. Pan

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Abstract

The recently discovered superconductor MgB₂ with T_c at 39 K has great potential in superconducting microelectronics. Thermodynamics studies with the calculation of phase diagrams (CALPHAD) modelling technique show that due to the high volatility of Mg, MgB₂ is only thermodynamically stable under fairly high Mg overpressures for likely in situ growth temperatures. This provides a helpful insight into the appropriate processing conditions for MgB₂ thin films, including the identification of the pressure-temperature region for adsorption-controlled growth. The initial MgB₂ thin films were made by pulsed laser deposition followed by in situ annealing. The cross-sectional transmission electron microscopy reveals a nanocrystalline mixture of textured MgO and MgB₂ with very small grain sizes. A zero-resistance transition temperature of 34 K and a zero-field critical current density of 1.3 × 10⁶ A cm^-2 were obtained. The qualities of these films are limited by the thermodynamic stability conditions, which favour deposition techniques that can maintain a high flux of Mg.

Original language	English (US)
Pages (from-to)	451-457
Number of pages	7
Journal	Superconductor Science and Technology
Volume	15
Issue number	3
DOIs	https://doi.org/10.1088/0953-2048/15/3/333
State	Published - Mar 2002

All Science Journal Classification (ASJC) codes

Ceramics and Composites
Condensed Matter Physics
Metals and Alloys
Electrical and Electronic Engineering
Materials Chemistry

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Xi, X. X., Zeng, X. H., Soukiassian, A., Jones, J., Hotchkiss, J., Zhong, Y., Brubaker, C. O., Liu, Z. K., Lettieri, J., Schlom, D. G., Hu, Y. F., Wertz, E., Li, Q., Tian, W., Sun, H. P., & Pan, X. Q. (2002). Thermodynamics and thin film deposition of MgB₂ superconductors. Superconductor Science and Technology, 15(3), 451-457. https://doi.org/10.1088/0953-2048/15/3/333

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title = "Thermodynamics and thin film deposition of MgB2 superconductors",

abstract = "The recently discovered superconductor MgB2 with Tc at 39 K has great potential in superconducting microelectronics. Thermodynamics studies with the calculation of phase diagrams (CALPHAD) modelling technique show that due to the high volatility of Mg, MgB2 is only thermodynamically stable under fairly high Mg overpressures for likely in situ growth temperatures. This provides a helpful insight into the appropriate processing conditions for MgB2 thin films, including the identification of the pressure-temperature region for adsorption-controlled growth. The initial MgB2 thin films were made by pulsed laser deposition followed by in situ annealing. The cross-sectional transmission electron microscopy reveals a nanocrystalline mixture of textured MgO and MgB2 with very small grain sizes. A zero-resistance transition temperature of 34 K and a zero-field critical current density of 1.3 × 106 A cm-2 were obtained. The qualities of these films are limited by the thermodynamic stability conditions, which favour deposition techniques that can maintain a high flux of Mg.",

author = "Xi, {X. X.} and Zeng, {X. H.} and A. Soukiassian and J. Jones and J. Hotchkiss and Yu Zhong and Brubaker, {C. O.} and Liu, {Zi Kui} and J. Lettieri and Schlom, {D. G.} and Hu, {Y. F.} and E. Wertz and Qi Li and W. Tian and Sun, {H. P.} and Pan, {X. Q.}",

year = "2002",

month = mar,

doi = "10.1088/0953-2048/15/3/333",

language = "English (US)",

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AU - Zhong, Yu

AU - Brubaker, C. O.

AU - Liu, Zi Kui

AU - Lettieri, J.

AU - Schlom, D. G.

AU - Hu, Y. F.

AU - Wertz, E.

AU - Li, Qi

AU - Tian, W.

AU - Sun, H. P.

AU - Pan, X. Q.

PY - 2002/3

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N2 - The recently discovered superconductor MgB2 with Tc at 39 K has great potential in superconducting microelectronics. Thermodynamics studies with the calculation of phase diagrams (CALPHAD) modelling technique show that due to the high volatility of Mg, MgB2 is only thermodynamically stable under fairly high Mg overpressures for likely in situ growth temperatures. This provides a helpful insight into the appropriate processing conditions for MgB2 thin films, including the identification of the pressure-temperature region for adsorption-controlled growth. The initial MgB2 thin films were made by pulsed laser deposition followed by in situ annealing. The cross-sectional transmission electron microscopy reveals a nanocrystalline mixture of textured MgO and MgB2 with very small grain sizes. A zero-resistance transition temperature of 34 K and a zero-field critical current density of 1.3 × 106 A cm-2 were obtained. The qualities of these films are limited by the thermodynamic stability conditions, which favour deposition techniques that can maintain a high flux of Mg.

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Thermodynamics and thin film deposition of MgB₂ superconductors

Abstract

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