【摘 要】
：
The recently discovered kagome metal series AV3Sb5(A=K,Rb,Cs)exhibits topologically nontrivial band structures,chiral charge order and superconductivity,presenting a unique platform for realizing exotic electronic states.The nature of the super-conducting
【机 构】
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Center for Correlated Matter and Department of Physics,Zhejiang University,Hangzhou 310058,China;Zhe
【出 处】
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中国科学：物理学 力学 天文学（英文版）
论文部分内容阅读
The recently discovered kagome metal series AV3Sb5(A=K,Rb,Cs)exhibits topologically nontrivial band structures,chiral charge order and superconductivity,presenting a unique platform for realizing exotic electronic states.The nature of the super-conducting state and the corresponding pairing symmetry are key questions that demand experimental clarification.Here,using a technique based on the tunneling diode oscillator,the magnetic penetration depth Δλ(T)of CsV3Sb5 was measured down to 0.07 K.A clear exponential behavior in Δλ(T)with marked deviations from a T or T2 temperature dependence was observed at low temperatures,indicating an absence of nodal quasiparticles.Temperature dependence of the superfluid density and electronic specific heat can be described by two-gap s-wave superconductivity,consistent with the presence of multiple Fermi surfaces in CsV3Sb5.These results evidence nodeless superconductivity in CsV3Sb5 under ambient pressure,and constrain the allowed pairing symmetry.
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