Evidence for Two-Band Superconductivity from Break Junction Tunneling on MgB2

H. Schmidt; J. F. Zasadzinski; K. E. Gray; D. G. Hinks

doi:10.1103/PhysRevLett.88.127002

Evidence for Two-Band Superconductivity from Break Junction Tunneling on MgB2

Superconductivity 2009-11-07 v2

Authors: H. Schmidt , J. F. Zasadzinski , K. E. Gray , D. G. Hinks

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Abstract

Superconductor-insulator-superconductor tunnel junctions have been fabricated on MgB2 that display Josephson and quasiparticle currents. These junctions exhibit a gap magnitude, Delta~2.5 meV, that is considerably smaller than the BCS value, but which clearly and reproducibly closes near the bulk Tc. In conjunction with fits of the conductance spectra, these results are interpreted as direct evidence of two-band superconductivity.

Keywords

MgB2 Josephson junction tunneling two-band superconductivity gap magnitude

Cite

@article{arxiv.cond-mat/0112144,
  title  = {Evidence for Two-Band Superconductivity from Break Junction Tunneling on MgB2},
  author = {H. Schmidt and J. F. Zasadzinski and K. E. Gray and D. G. Hinks},
  journal= {arXiv preprint arXiv:cond-mat/0112144},
  year   = {2009}
}

Comments

4 pages, 4 figures; minor revisions

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