Phys. Rev. Lett. 89, 187003 (2002) [4 pages]Vortex Imaging in the π Band of Magnesium DiborideReceived 14 June 2002; published 11 October 2002 We report scanning tunneling spectroscopy imaging of the vortex lattice in single crystalline MgB2. By tunneling parallel to the c axis, a single superconducting gap (Δ=2.2 meV) associated with the π band is observed. The vortices in the π band have a large core size compared to estimates based on Hc2 and show an absence of localized states in the core. Furthermore, superconductivity between the vortices is rapidly suppressed by an applied field. These results suggest that superconductivity in the π band is, at least partially, induced by the intrinsically superconducting σ band. © 2002 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.89.187003
DOI:
10.1103/PhysRevLett.89.187003
PACS:
74.70.Ad, 74.50.+r, 74.60.Ec
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