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

Authors
Journal
Physica C Superconductivity
0921-4534
Publisher
Elsevier
Publication Date
Volume
471
Identifiers
DOI: 10.1016/j.physc.2011.05.009
Keywords
  • Iron-Based Superconductor Fe(Se
  • Te)
  • Powder X-Ray Diffraction
  • Specific Heat
  • Electronic Specific-Heat Coefficient
  • Superconducting Condensation Energy
  • Superconducting Gap
Disciplines
  • Physics

Abstract

Abstract Annealing effects of FeSe 1− x Te x (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, T c, 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, U 0, and the SC gap, Δ 0, at 0 K have been estimated as ∼1.8 J/mol and 2.3–2.5 meV, respectively. The value of 2 Δ 0/ k B T c is 3.9–4.5, indicating a little strong-coupling superconductivity. Both the electronic specific-heat coefficient in the normal state, γ n , and the residual electronic specific-heat coefficient in the SC state, γ 0, have been found to show significant x dependence. The values of γ n are much larger than those estimated from the band calculation.

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