Phys. Rev. Lett. 89, 187002 (2002) [4 pages]Two-Band Superconductivity in MgB2Received 31 January 2002; published 11 October 2002 The study of the anisotropic superconductor MgB2 using a combination of scanning tunneling microscopy and spectroscopy reveals two distinct energy gaps at Δ1=2.3 meV and Δ2=7.1 meV at 4.2 K. Different spectral weights of the partial superconducting density of states are a reflection of different tunneling directions in this multiband system. Temperature evolution of the tunneling spectra follows the BCS scenario [ Phys. Rev. Lett. 3 552 (1959)] with both gaps vanishing at the bulk Tc. The data confirm the importance of Fermi-surface sheet dependent superconductivity in MgB2 proposed in the multigap model by Liu et al. [ Phys. Rev. Lett. 87 087005 (2001)]. © 2002 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.89.187002
DOI:
10.1103/PhysRevLett.89.187002
PACS:
74.25.Jb, 74.50.+r, 74.70.Ad
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