Characterisation of MgB 2 thin films of varying T c by Raman spectroscopy

Raman spectra of a series of thin films of the superconductor MgB 2 have been measured as a function of the T c of the films. An interesting correlation is observed between the Raman shift of the E 2 g mode and the T c. We propose a mechanism for the T c reduction, which has consequences for the beh...

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Bibliographic Details
Published inThe Journal of physics and chemistry of solids Vol. 67; no. 1; pp. 333 - 335
Main Authors Yates, K.A., Burnell, G., Lockman, Z., Kursumovic, A., MacManus Driscoll, J.L., Blamire, M.G.
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 2006
Subjects
C. Raman Spectroscopy
D. Superconductivity
C. Raman Spectroscopy
D. Superconductivity
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Summary:Raman spectra of a series of thin films of the superconductor MgB 2 have been measured as a function of the T c of the films. An interesting correlation is observed between the Raman shift of the E 2 g mode and the T c. We propose a mechanism for the T c reduction, which has consequences for the behaviour of the two superconducting gaps in MgB 2 for samples of very reduced T c (≤19 K). Additionally, the effects of oxygenation on the properties of MgB 2 have been studied in order to develop an understanding of the effects of structural distortion in this material.
ISSN:0022-3697
1879-2553
DOI:10.1016/j.jpcs.2005.10.114