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by scanning tunneling spectroscopy M.R. Eskildsen ,*, M. Kugler a, G. Levy a, S. Tanaka a,b, J. Jun c, S.M. Kazakov c, J. Karpinski c, O. Fischer a a Département de Physique de la Matière Condensée, Université de Genève, 24 Quai E.-Ansermet, CH-1211, Genève 4, Switzerland b Kansai Advanced Research Center, Communications Research Laboratory, 588-2, Iwaoka, Nishi-ku, Japan c Solid State Physics Laboratory, ETH Zurich, CH-8093 Zurich, Switzerland We report on the results of scanning tunneling spectroscopy measurements on single crystals of MgB2. Tunneling was performed parallel to the crystalline c-axis, and a single superconducting gap (Δn = 2.2 meV) associated with the π-band is observed. Vortex imaging in the π-band was performed with the field parallel to the c-axis. The vortices are found to be organized in a well-ordered hexagonal lattice. © 2003 Elsevier Science B.V. All rights reserved. Keywords: MgB2; STS; Vortex |