The invention of the new layered superconductor by intercalation and the ion exchange.

本文研究了FeSe1-xTex(0。6≦x≦1)单晶生长，在真空中400℃退火100-200小时。在x=0的退火单晶中，在超导转变温度Tc处出现了明显的比热跳变体超导现象。6 - 0。9. 对于x=0的退火单晶。6 - 0。9、估计了0 K时SC凝结能、U0、热力学临界场、Hc(0)、0 K时SC间隙、Δ0和ΔC/(γn-γ0)Tc [ΔC: Tc处的比热跳变，γn：正常状态下的电子比热系数，γ0: SC状态下0 K处的剩余电子比热系数]。发现x=0的单晶在200h退火时超导性最强。其中，利用单波段BCS s波模型估算的2Δ0/kBTc和ΔC/(γn-γ0)Tc分别为4。29和2。76，表明超导性是强耦合的。

We have investigated the electronic specific heat of FeSe1-xTex (0. 6≦x≦1)single crystals as-grown and annealed at 400℃ for 100-200 h in vacuum. The appearance of bulk superconductivity with a clear specific-heat jump at the superconducting (SC)transition temperature, Tc has been confirmed in annealed single-crystals of x=0. 6-0. 9. For annealed single-crystals of x=0. 6-0. 9, values of the SC condensation energy at 0 K, U0, the thermodynamic critical field, Hc(0), the SC gap at 0 K, Δ0 and ΔC/(γn-γ0)Tc [ΔC : the specific-heat jump at Tc, γn : the electronic specific-heat coefficient in the normal state, γ0 : the residual electronic specific-heat coefficient at 0 K in the SC state] have been estimated. It has been found the superconductivity is strongest in the 200h-annealed single-crystal of x=0. 7, where 2Δ0/kBTc estimated using the single-band BCS s-wave model and ΔC/(γn-γ0)Tc are 4. 29 and 2. 76, respectively, indicating that the superconductivity is strong-coupling.