Annealing effects on the crystal structure and physical properties of FeSe1-xTex (0.6 ≦ x ≦ 1) single crystals

M. Imaizumi, T. Noji, T. Adachi, Y. Koike

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

Annealing effects of FeSe1-xTex (0.6 ≦ x ≦ 1) single crystals have been investigated from measurements of the powder X-ray diffraction and specific heat. Through the annealing, several peaks of powder X-ray diffraction have become sharp and a clean jump of the specific-heat at the superconducting (SC) transition temperature, Tc, has been observed for x = 0.6-0.9, indicating bulk superconductivity. For annealed single-crystals of x = 0.6-0.8, the SC condensation energy, U0, and the SC gap, Δ0, at 0 K have been estimated as ∼1.8 J/mol and 2.3-2.5 meV, respectively. The value of 2Δ0/k BTc is 3.9-4.5, indicating a little strong-coupling superconductivity. Both the electronic specific-heat coefficient in the normal state, γn, and the residual electronic specific-heat coefficient in the SC state, γ0, have been found to show significant x dependence. The values of γn are much larger than those estimated from the band calculation.

Original languageEnglish
Pages (from-to)614-617
Number of pages4
JournalPhysica C: Superconductivity and its applications
Volume471
Issue number21-22
DOIs
Publication statusPublished - 2011 Nov

Keywords

  • Electronic specific-heat coefficient
  • Iron-based superconductor Fe(Se,Te)
  • Powder X-ray diffraction
  • Specific heat
  • Superconducting condensation energy
  • 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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