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

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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)
Pages (from-to)147006-1-147006-4
JournalPhysical Review Letters
Volume93
Issue number14
DOIs
StatePublished - Oct 1 2004

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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    Pogrebnyakov, A. V., Redwing, J. M., Raghavan, S., Vaithyanathan, V., Schlom, D. G., Xu, S. Y., Li, Q., Tenne, D. A., Soukiassian, A., Xi, X. X., Johannes, M. D., Kasinathan, D., Pickett, W. E., Wu, J. S., & Spence, J. C. H. (2004). Enhancement of the superconducting transition temperature of MgB2 by a strain-induced bond-stretching mode softening. Physical Review Letters, 93(14), 147006-1-147006-4. https://doi.org/10.1103/PhysRevLett.93.147006