MgB2 energy gap determination by scanning tunnelling spectroscopy

T. W. Heitmann, S. D. Bu, D. M. Kim, J. H. Choi, J. Giencke, C. B. Eom, K. A. Regan, N. Rogado, M. A. Hayward, T. He, J. S. Slusky, P. Khalifah, M. Haas, R. J. Cava, D. C. Larbalestier, M. S. Rzchowski

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Abstract

We report scanning tunnelling 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 tunnelling 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 Δ = 2.2-2.8 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, Δ = 7.2 meV, consistent with a proposed two-hand model.

Original languageEnglish (US)
Pages (from-to)237-242
Number of pages6
JournalSuperconductor Science and Technology
Volume17
Issue number2
DOIs
StatePublished - Feb 1 2004

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Condensed Matter Physics
  • Metals and Alloys
  • Electrical and Electronic Engineering
  • Materials Chemistry

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    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. (2004). MgB2 energy gap determination by scanning tunnelling spectroscopy. Superconductor Science and Technology, 17(2), 237-242. https://doi.org/10.1088/0953-2048/17/2/001