Nanoscale disorder in high critical field, carbon-doped MgB2 hybrid physical-chemical vapor deposition thin films

Y. Zhu, D. C. Larbalestier, P. M. Voyles, A. V. Pogrebnyakov, X. X. Xi, Joan Marie Redwing

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Abstract

Carbon-doped Mg B2 thin films deposited by hybrid physical-chemical vapor deposition (HPCVD) can have Hc2 (0 K) ∼70 T, anomalously high compared to bulk samples which have Hc2 about half this value. Using transmission electron microscopy, the authors show that the carbon content in HPCVD-grown Mg (B1-x Cx) 2 grains is x≤5%, and that most carbon forms an amorphous intergranular phase. The authors also find extensive structural disorder, including rotations about the c axis and small tilts of the c axis, with a domain size of 5-20 nm. The authors propose that strong electron scattering from the nanoscale disorder is responsible for the very high Hc2 in such films.

Original languageEnglish (US)
Article number082513
JournalApplied Physics Letters
Volume91
Issue number8
DOIs
StatePublished - Aug 31 2007

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All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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