TY - JOUR
T1 - Annealing effects on the crystal structure and physical properties of FeSe1-xTex (0.6 ≦ x ≦ 1) single crystals
AU - Imaizumi, M.
AU - Noji, T.
AU - Adachi, T.
AU - Koike, Y.
N1 - Funding Information:
The authors would like to thank N.L. Saini and T. Mizokawa for valuable discussion and suggestion. This work was supported by a Grant-in-Aid for Scientific Research from the Japan Society for the Promotion of Science.
Copyright:
Copyright 2011 Elsevier B.V., All rights reserved.
PY - 2011/11
Y1 - 2011/11
N2 - 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.
AB - 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.
KW - Electronic specific-heat coefficient
KW - Iron-based superconductor Fe(Se,Te)
KW - Powder X-ray diffraction
KW - Specific heat
KW - Superconducting condensation energy
KW - Superconducting gap
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U2 - 10.1016/j.physc.2011.05.009
DO - 10.1016/j.physc.2011.05.009
M3 - Article
AN - SCOPUS:80054999113
VL - 471
SP - 614
EP - 617
JO - Physica C: Superconductivity and its Applications
JF - Physica C: Superconductivity and its Applications
SN - 0921-4534
IS - 21-22
ER -