Correlation between the superconducting and structural properties in MgB[sub 2] thin films prepared by molecular-beam epitaxy

Yamazaki, Hiroki; Hikita, Yasuyuki; Hori, Hiroki; Takaqib, Hidenori
November 2003
Applied Physics Letters;11/3/2003, Vol. 83 Issue 18, p3740
Academic Journal
Superconducting MgB[sub 2] films were prepared on an Al[sub 2]O[sub 3](0001) substrate by codeposition of Mg and B using the molecular-beam epitaxy technique and the effects of the growth conditions on the structural and the superconducting properties were extensively investigated. The superconducting transition temperature T[sub c] shows a peak as a function of the deposition-rate ratio of Mg to B[sub 2] and the stoichiometric composition is likely realized at the T[sub c] peak. The optimum substrate temperature T[sub s] was found to be 330 °C. Detailed structural characterizations indicate the strong suppression of structural coherence in the stoichiometric and Mg-rich films. This accounts for the fact that optimized T[sub c] (26.6 K) is still lower than bulk T[sub c] like in previous molecular-beam epitaxy studies. We argue that such structural disorder originates from epitaxial strain due to the lattice mismatch between the film and the substrate. © 2003 American Institute of Physics.


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