Tunneling spectroscopy of the superconducting energy gap in RNi2B2C (R=Y and Lu)

Toshikazu Ekino, Hironobu Fujii, Makoto Kosugi, Yuji Zenitani, Jun Akimitsu

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Abstract

Superconducting energy gap in RNi2B2C (R=Y and Lu) has been investigated using a break-junction tunneling technique. The observed differential conductance dIldV is well described by the BCS density of states with a small lifetime broadening parameter. We have found small gap values for the local low-Tc phases in addition to the bulk Tc of 15.6-16.6 K. The gap value of 2Δ=4.5 meV with Tc=15 K gives the BCS ratio of 2Δ/kBTc=3.5, which is kept constant down to the observed lowest Tc of 4.6 K. These results give clear evidence for the BCS mechanism of superconductivity for these compounds.

Original languageEnglish
Pages (from-to)5640-5649
Number of pages10
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume53
Issue number9
Publication statusPublished - Mar 1 1996
Externally publishedYes

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Superconductivity
Energy gap
Spectroscopy
spectroscopy
superconductivity
life (durability)

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Tunneling spectroscopy of the superconducting energy gap in RNi2B2C (R=Y and Lu). / Ekino, Toshikazu; Fujii, Hironobu; Kosugi, Makoto; Zenitani, Yuji; Akimitsu, Jun.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 53, No. 9, 01.03.1996, p. 5640-5649.

Research output: Contribution to journalArticle

Ekino, Toshikazu ; Fujii, Hironobu ; Kosugi, Makoto ; Zenitani, Yuji ; Akimitsu, Jun. / Tunneling spectroscopy of the superconducting energy gap in RNi2B2C (R=Y and Lu). In: Physical Review B - Condensed Matter and Materials Physics. 1996 ; Vol. 53, No. 9. pp. 5640-5649.
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