Superconducting energy gaps in Bi2Sr2CuO6+y and Bi2Sr2-xNdxCuO6+y

Toshikazu Ekino, Tohru Den, Jun Akimitsu

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Abstract

Superconducting energy gaps in Bi2Sr2-xNdxCuO6+y (0≤x≤0.7) with Tc=6.5-20 K have been studied by the electron tunneling technique. The smallest gap value was found at ±2 meV for x=0 with Tc=6.5 K. The obtained gap values almost scale with x and thus Tc throughout the superconducting phase. The ratio 2Δpeak/kBTc=7.1 (2Δ/kBTc=4-5 with Δ from the BCS analysis) for the sample with Tc=6.5 K is still larger than the BCS ratio 3.5 of non-copper oxides (BaPb0.75Bi0.25O3 and Li1+xTi2-xO4) with Tc=11-12 K, indicating a substantial pairing nature difference between them.

Original languageEnglish
Pages (from-to)387-395
Number of pages9
JournalPhysica C: Superconductivity and its applications
Volume218
Issue number3-4
DOIs
Publication statusPublished - Dec 15 1993
Externally publishedYes

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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