Nodeless superconductivity in the kagome metal CsV3Sb5

By W. Duan, Z. Nie, S. Luo, F. Yu, B. Ortiz, L. Yin, H. Su, F. Du, An Wang, Ye Chen and 6 more. Science China Physics Mechanics and Astronomy, 2021

173 citations recorded by the source corpus.

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 superconducting 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.

Subfields: Atomic and Molecular Physics, and Optics, Condensed Matter Physics, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/2516c57e2bc6aa21472299913cfc88cf21f52e77

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Atomic and Molecular Physics, and Optics

1. B. Ortiz
2. R. Seshadri
3. S. Teicher
4. Mazhar N. Ali
5. Stephen D. Wilson
6. P. Sarte

In Materials Chemistry

1. R. Seshadri
2. Mazhar N. Ali

Citations in the corpus

• Quantum states and intertwining phases in kagome materials (2023, background): “113,188), evidenced by the appearance of the Hebel–Slichter coherence peak at ambient pressure in the nuclear quadrupole resonance (NQR) and NMR measurement 113 , as well as exponential behaviour of the magnetic penetration depth λ T ∆ ( ) in a tunnelling diode oscillator measurement (which…”
• Fermi Surface Mapping and the Nature of Charge-Density-Wave Order in the Kagome Superconductor CsV3Sb5 (2021, background): “While there are multiple gaps identified [25, 26] with both evidence of s-wave pairing [27] and evidence of nodal quasiparticles [28], the interplay between superconductivity and the CDW state can in principle lead to unconventional behavior even in a fully gapped superconducting state [29].”