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The electronic specific heat of as-grown and annealed single-crystals ofFeSe1-xTex (0.6<=x<=1) has been investigated. It has been found that annealedsingle-crystals with x=0.6-0.9 exhibit bulk superconductivity with a clearspecific-heat jump at the superconducting (SC) transition temperature, Tc. Both2Delta_0/kBTc [Delta_0: the SC gap at 0 K estimated using the single-band BCSs-wave model] and Delta C/(gamma_n-gamma_0)Tc [Delta C$: the specific-heat jumpat Tc, gamma_n: the electronic specific-heat coefficient in the normal state,gamma_0: the residual electronic specific-heat coefficient at 0 K in the SCstate] are largest in the well-annealed single-crystal with x=0.7, i.e., 4.29and 2.76, respectively, indicating that the superconductivity is of the strongcoupling. The thermodynamic critical field has also been estimated. gamma_n hasbeen found to be one order of magnitude larger than those estimated from theband calculations and increases with increasing x at x=0.6-0.9, which issurmised to be due to the increase in the electronic effective mass, namely,the enhancement of the electron correlation. It has been found that thereremains a finite value of gamma_0 in the SC state even in the well-annealedsingle-crystals with x=0.8-0.9, suggesting an inhomogeneous electronic state inreal space and/or momentum space.

journal of the physical society of japan

Specific-heat study of superconducting and normal states in FeSe1-xTex  (0.6<=x<=1) single crystals: Strong-coupling superconductivity, strong  electron-correlation, and inhomogeneity