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Evidence for two superconducting gaps in MgB2 | | X K Chen
; M J Konstantinovic
; J C Irwin
; D D Lawrie
; J P Franck
; | | Date: |
8 Oct 2001 | | Journal: | Phys Rev Lett, 87 (15), 157002 | | Abstract: | We have measured the Raman spectra of polycrystalline MgB2 from 25 to 1200 cm(-1). A superconductivity-induced redistribution in the electronic Raman continuum was observed. Two pair-breaking peaks appear in the spectra, suggesting the presence of two superconducting gaps. The measured spectra were analyzed using a quasi-two-dimensional model in which two s-wave superconducting gaps open on two sheets of Fermi surface. For the gap values we have obtained Delta(1) = 22 cm(-1) ( 2.7 meV) and Delta(2) = 50 cm(-1) ( 6.2 meV). Our results suggest that a conventional phonon-mediated pairing mechanism occurs in the planar boron sigma bands and is responsible for the superconductivity of MgB2. | | Source: | PubMed, pmid11580720 | | Services: | Forum | Review | Favorites | |
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