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Graphene Micro-Substrate Induced High Electron-Phonon Coupling in \hbox {MgB}_{2}

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5 Author(s)
W. X. Li ; Inst. for Supercond. & Electron. Mater., Univ. of Wollongong, Wollongong, NSW, Australia ; X. Xu ; K. S. B. De Silva ; F. X. Xiang
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Electron-phonon coupling strength was studied in graphene-MgB2 composites to explore the possibilities for a higher superconducting transition temperature (Tc). For the first time in the experimental work on MgB2, the Raman active E2g mode was split into two parts: a softened mode corresponding to tensile strain and a hardened mode attributed to the carbon substitution effect. The tensile strain effect is suggested to improve Tc of graphene-MgB2 composites because it increases the electron-phonon coupling strength of MgB2.

Published in:

IEEE Transactions on Applied Superconductivity  (Volume:23 ,  Issue: 3 )