1111型CaFe_{0.88} Co_{0.12} AsF单晶中低温specific heat显示的多重能隙
Multiple gaps revealed by low temperature specific heat in the 1111-type CaFe_{0.88}Co_{0.12}AsF single crystals
摘要：
测量了1111型CaFe_{0.88} Co_{0.12} AsF单晶在不同磁场下的低温比热。明显的SH跳跃，高度ΔC/T|在超导转变温度T_c处测得_Tc = 10.4 mJ/mol K^2。电子SH系数Δγ（B）在5 T以下随磁场线性增加，在5 T附近观察到扭结，表明本系统具有多能隙特征.这种迹象也反映在Tc-B数据中。详细的分析表明，这一现象可以用Δ L=Δ S = 2：8-4：5的双能隙模型来解释。
英文摘要：
Low-temperature specific heat (SH) is measured on the 1111-type CaFe_{0.88}Co_{0.12}AsF single crystals under different magnetic fields. A clear SH jump with the height ΔC/T|_Tc = 10.4 mJ/mol K^2 was observed at the superconducting transition temperature T_c. The electronic SH coefficient Δγ(B) increases linearly with the field below 5 T and a kink is observed around 5 T, indicating a multi-gap feature in the present system. Such a sign is also reflected in the Tc-B data. A detailed analysis shows that this behavior can be interpreted in terms of a two-gap scenario with the ratio Δ_L=Δ_S = 2:8-4:5.
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