Abstract

Oxygen was systematically incorporated in MgB2 films using in situ postgrowth anneals in an oxygen environment. Connectivity analysis in combination with measurements of the critical temperature (Tc) and resistivity (ρ) indicate that oxygen is distributed both within and between the grains. High values of critical current densities (Jc) in field (∼4× 105 A cm2 at 8 T and 4.2 K), extrapolated critical fields [Hc2 (0)] (>45 T), and slopes of critical field versus temperature (1.4 TK) are observed. Our results suggest that low growth temperatures (300 °C) and oxygen doping (0.65%) can produce MgB2 with high Jc values in field and Hc2 for high-field magnet applications.

Original languageEnglish (US)
Article number242504
JournalApplied Physics Letters
Volume93
Issue number24
DOIs
StatePublished - 2008

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oxygen
high field magnets
critical current
critical temperature
temperature distribution
current density
slopes
electrical resistivity
temperature

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

Cite this

Effect of oxygen incorporation on normal and superconducting properties of MgB2 films. / Singh, Rakesh; Shen, Y.; Gandikota, R.; Carvalho, C.; Rowell, J. M.; Newman, Nathan.

In: Applied Physics Letters, Vol. 93, No. 24, 242504, 2008.

Research output: Contribution to journalArticle

Singh, Rakesh ; Shen, Y. ; Gandikota, R. ; Carvalho, C. ; Rowell, J. M. ; Newman, Nathan. / Effect of oxygen incorporation on normal and superconducting properties of MgB2 films. In: Applied Physics Letters. 2008 ; Vol. 93, No. 24.
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AU - Newman, Nathan

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