Point-contact spectroscopy measurements of binary superconductor MgB 2

T. Takasaki, T. Ekino, R. A. Ribeiro, T. Muranaka, H. Fujii, J. Akimitsu

Research output: Contribution to journalConference articlepeer-review

5 Citations (Scopus)


We studied the superconductor MgB2 by point-contact spectroscopy. The first derivative conductance of the current (I)-voltage (V) characteristics dI/dV(V) displays the Andreev reflection features at the superconductor-normal metal interface. The largest gap values are estimated to be Δ(4.2 K) = 9-12 meV. We also observed clear evidences for the multiple-gaps feature with the small gap Δ(4.2 K) = 1-3 meV. These gap values agree with the previous break-junction data. The observed peak positions in the second derivative conductance (d2I/dV2(V)) are consistent with the phonon density of states of inelastic neutron scattering measurements.

Original languageEnglish
Pages (from-to)300-303
Number of pages4
JournalPhysica C: Superconductivity and its applications
Issue numberI
Publication statusPublished - Oct 1 2005
Externally publishedYes
EventProceedings of the 17th International Symposium on Superconductivity (ISS 2004) Advances in Supeconductivity -
Duration: Nov 23 2004Nov 25 2004


  • Electron-phonon interaction
  • MgB
  • Point-contact spectroscopy
  • Superconducting gap

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering


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