RbFe_{2} As_{2}的超流密度和超导带隙随hydrostatic pressure的变化
Superfluid density and superconducting gaps of RbFe_{2}As_{2} as a function of hydrostatic pressure
摘要：
用磁化率和μ子自旋谱测量了超导RbFe_{2} As_{2}的超流密度和超导带隙随温度、磁场和流体静压的变化。从这些数据中得到了超导态的基本微观参数，如伦敦穿透深度λ、能隙值Δ、上临界场B_{c2}和金兹伯格-朗道参数κ。根据先前的测量，发现在环境压力下，强空穴过掺杂RbFe_{2} As_2中的超流密度n_{s} \propto λ^{-2}与超导转变温度T_{c} =2.52（2）K的比值比高T_{c} Fe基和其他非常规超导体大得多。作为压力的函数，T_{c}以dT_{c} /dp = -1.32 K/GPa的速率强烈减小，即在p = 1 GPa时减小52%。n_{s}的温度依赖性最好用两个超导能隙s波模型来描述，其中两个超导能隙都被流体静压力减小，直到较小的能隙在p = 1 GPa时完全消失。
英文摘要：
The superfluid density and superconducting gaps of superconducting RbFe_{2}As_{2} have been determined as a function of temperature, magnetic field and hydrostatic pressure by susceptibility and muon-spin spectroscopy measurements. From the data, fundamental microscopic parameters of the superconducting state like the London penetration depth λ, the gap values Δ, the upper critical field B_{c2}, and the Ginzburg-Landau parameter κhave been obtained. In accordance with earlier measurements the ratio of the superfluid density n_{s} \propto λ^{-2} to the superconducting transition temperature T_{c}=2.52(2) K at ambient pressure is found to be much larger in the strongly hole-overdoped RbFe_{2}As_2 than in high-T_{c} Fe-based and other unconventional superconductors. As a function of pressure T_{c} strongly decreases with a rate of dT_{c}/dp = -1.32 K/GPa, i.e. it is reduced by 52 % at p = 1 GPa. The temperature dependence of n_{s} is best described by a two gap s-wave model with both superconducting gaps being decreased by hydrostatic pressure until smaller gap completely disappears at p = 1 GPa.
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