Vortex Imaging in the π Band of Magnesium Diboride

M. R. Eskildsen, M. Kugler, S. Tanaka, J. Jun, S. M. Kazakov, J. Karpinski, and Ø. Fischer
Phys. Rev. Lett. 89, 187003 – Published 11 October 2002

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=2.2meV) 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.

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  • Received 14 June 2002

DOI:https://doi.org/10.1103/PhysRevLett.89.187003

©2002 American Physical Society

Authors & Affiliations

M. R. Eskildsen1,*, M. Kugler1, S. Tanaka1,2, J. Jun3, S. M. Kazakov3, J. Karpinski3, and Ø. Fischer1

  • 1DPMC, University of Geneva, 24 Quai E.-Ansermet, CH-1211 Genève 4, Switzerland
  • 2Department of Physics, Saga University, Saga 840-8502, Japan
  • 3Solid State Physics Laboratory, ETH, CH-8093 Zürich, Switzerland

  • *Electronic address: morten.eskildsen@physics.unige.ch

See Also

Two-Band Superconductivity in MgB2

M. Iavarone, G. Karapetrov, A. E. Koshelev, W. K. Kwok, G. W. Crabtree, D. G. Hinks, W. N. Kang, Eun-Mi Choi, Hyun Jung Kim, Hyeong-Jin Kim, and S. I. Lee
Phys. Rev. Lett. 89, 187002 (2002)

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Vol. 89, Iss. 18 — 28 October 2002

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