Vortex Imaging in the π Band of Magnesium Diboride

M. R. Eskildsen; M. Kugler; S. Tanaka; J. Jun; S. M. Kazakov; J. Karpinski; Ø. Fischer

doi:10.1103/PhysRevLett.89.187003

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Vortex Imaging in the π Band of Magnesium Diboride

M. R. Eskildsen, M. Kugler, S. Tanaka, J. Jun, S. M. Kazakov, J. Karpinski, Ø. Fischer

DOI 10.1103/PhysRevLett.89.187003 · Physical Review Letters

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Abstract

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.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	39	Pressure not reported	unknown
MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	38.5	Pressure not reported	onset
MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown