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The lattice effect induced by tensile strain on the superconductivity of graphene–MgB 2 composites was studied systematically to deduce the electron–phonon coupling (EPC) and the multiple superconducting gap behavior. Compared with nano-carbon doped MgB 2 , graphene–MgB 2 composites show larger lattice parameters and higher critical superconducting transition temperatures (T...
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