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

研究了FeSe1-xTex(0。6≦x≦1)单晶，在400℃下真空退火100-200h。在x=0的单晶中，证实了在超导(SC)转变温度T_c出现明显的比热跳跃的大块超导电性。6-0。9.对于x=0的退火单晶。6-0。计算了Sc在0 K时的凝聚能U0、热力学临界场Hc(0)、0 K时的Sc能隙、Δ0和ΔC/(γn-γ0)T_c[ΔC：T_c的比热跃迁，γ_n：正常态的电子比热系数，γ_0：Sc态在0 K的剩余电子比热系数]。发现在x=0的200h退火态单晶中超导电性最强。7，其中用单带BCS S波模型和ΔC/(Δn-γ0)T_c估算的2Δ_0/kBT_c分别为4.29和2.76，表明超导电性是强耦合的。

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.