Superconducting energy gap in spinel compound Li1-xTi2-xO4 from electron tunneling

T. Ekino, Jun Akimitsu

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

Superconducting energy gap in the spinel compound Li1+xTi2-xO4 has been measured by point contact electron tunneling. Observed gap values 2Δ mainly lie at 3.5-3.7meV for Tc=11.5K. The ratio 2Δ/kTc=3.5-3.7 is in good agreement with the BCS value. Polycrystalline samples were synthesized as follows. Starting materials of Li2O3 and Ti2O3 were mixed with 55% excess of Li in Li1+xTi2-xO4(x=0.05-0.06) composition and pressed and sintered at 1000-1300°C for 18hr with flowing the mixture of Ar and H2 gas. The resultant sample does not show the single phase and the Meissner volume fraction is 10% at most. It shows however sharp resistive transition at 13.3K with the width of 0.6K(x=0.06). To determine Tc at each tunnel junction, temperature dependence of differential conductance dI/dV was measured up to above Tc.

Original languageEnglish
Pages (from-to)1599-1600
Number of pages2
JournalPhysica B: Condensed Matter
Volume165-66
Issue number2
Publication statusPublished - Aug 1990
Externally publishedYes

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Electron tunneling
Tunnel junctions
Point contacts
electron tunneling
spinel
Volume fraction
Energy gap
Gases
Chemical analysis
tunnel junctions
Temperature
temperature dependence
gases
spinell

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Superconducting energy gap in spinel compound Li1-xTi2-xO4 from electron tunneling. / Ekino, T.; Akimitsu, Jun.

In: Physica B: Condensed Matter, Vol. 165-66, No. 2, 08.1990, p. 1599-1600.

Research output: Contribution to journalArticle

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