MgB2 Energy Gap Determination by Scanning Tunneling Spectroscopy
Heitmann, T. W. · Bu, S. D. · Kim, D. M. · Choi, J. H. · Giencke, J. · Eom, C. B. · Regan, K. A. · Rogado, N. · Hayward, M. A. · He, T. · Slusky, J. S. · Khalifah, P. · Haas, M. · Cava, R. J. · Larbalestier, D. C · Rzchowski, M. S.
Original · EN
We report scanning tunneling spectroscopy (STS) measurements of the gap properties of both ceramic MgB2 and c-axis oriented epitaxial MgB2 thin films. Both show a temperature dependent zero bias conductance peak and evidence for two superconducting gaps. We report tunneling spectroscopy of superconductor-insulator-superconductor (S-I-S) junctions formed in two ways in addition to normal metal-insulator-superconductor (N-I-S) junctions. We find a gap delta=2.3-2.8 meV, with spectral features and temperature dependence that are consistent between S-I-S junction types. In addition, we observe evidence of a second, larger gap, delta=7.2 meV, consistent with a proposed two-band model.
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