Point-contact spectroscopy measurements of binary superconductor MgB 2

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

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

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
Volume426-431
Issue numberI
DOIs
Publication statusPublished - Oct 1 2005
Externally publishedYes

Fingerprint

Point contacts
Superconducting materials
Spectroscopy
Derivatives
Inelastic neutron scattering
spectroscopy
Metals
Electric potential
inelastic scattering
neutron scattering
electric potential
metals

Keywords

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

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Point-contact spectroscopy measurements of binary superconductor MgB 2 . / Takasaki, T.; Ekino, T.; Ribeiro, R. A.; Muranaka, T.; Fujii, H.; Akimitsu, Jun.

In: Physica C: Superconductivity and its Applications, Vol. 426-431, No. I, 01.10.2005, p. 300-303.

Research output: Contribution to journalArticle

Takasaki, T. ; Ekino, T. ; Ribeiro, R. A. ; Muranaka, T. ; Fujii, H. ; Akimitsu, Jun. / Point-contact spectroscopy measurements of binary superconductor MgB 2 . In: Physica C: Superconductivity and its Applications. 2005 ; Vol. 426-431, No. I. pp. 300-303.
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