Enhancement of the superconducting transition temperature of MgB2 by a strain-induced bond-stretching mode softening

A. V. Pogrebnyakov, J. M. Redwing*, S. Raghavan, V. Vaithyanathan, D. G. Schlom, S. Y. Xu, Qi Li, D. A. Tenne, A. Soukiassian, X. X. Xi, M. D. Johannes, D. Kasinathan, W. E. Pickett, J. S. Wu, J. C H Spence

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

114 Scopus citations

Abstract

The increasing transition temperature (To) in MgB2 films deposited by hybrid physical-chemical vapor deposition (HPCVD) was analyzed. Investigations show that the Tc increased due to the softening of bond-stretching E2g phonon mode. The increased T c was observed in the epitaxial films of SiC and sapphire substrates. The results show that the E2g phonon softening was a possible avenue to achieve higher Tc in MgB2-related material systems.

Original languageEnglish (US)
Article number147006
Pages (from-to)147006-1-147006-4
JournalPhysical review letters
Volume93
Issue number14
DOIs
StatePublished - Oct 1 2004

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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