Abstract

In this paper we report a study that correlates the properties of superconducting MgB2 thin films with molecular-beam-epitaxy deposition parameters. We show the utility of using a thermochemical analysis of MgB2 synthesis to predict optimal growth conditions. The growth of stoichiometric films with improved crystalline quality can be achieved at enhanced temperatures using high reactant fluxes. High B flux enhances the sticking coefficient of Mg and facilitates higher growth temperatures and improved structural and electrical properties. With a Mg flux of ~16Å/s and a substrate temperature of 300°C, a superconducting transition temperature (Tc) of 37.7K with a narrow transition width (ΔTc<1K) was observed. Our work shows that a growth model must include the strong dependence of the Mg sticking coefficient on B flux.

Original languageEnglish (US)
Pages (from-to)107-112
Number of pages6
JournalJournal of Crystal Growth
Volume270
Issue number1-2
DOIs
StatePublished - Sep 15 2004

Keywords

  • A1. Molecular beam epitaxy
  • B2. Superconducting materials

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Inorganic Chemistry
  • Materials Chemistry

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