Direct observation of anisotropic Cooper pairing in kagome superconductor CsV3Sb5
arxiv(2024)
摘要
In the recently discovered kagome superconductor AV3Sb5 (A = K, Rb, and Cs),
the superconductivity is intertwined with an unconventional charge density wave
order. Its pairing symmetry remains elusive owing to the lack of direct
measurement of the superconducting gap in the momentum space. In this letter,
utilizing laser-based ultra-high-resolution and low-temperature angle-resolved
photoemission spectroscopy, we observe anisotropic Cooper pairing in kagome
superconductor CsV3Sb5. We detect a highly anisotropic superconducting gap
structure with an anisotropy over 80
direction on a Fermi surface originated from the 3d-orbital electrons of the V
kagome lattice. It is in stark contrast to the isotropic superconducting gap
structure on the other Fermi surface that is occupied by Sb 5p-orbital
electrons. Our observation of the anisotropic Cooper pairing in pristine
CsV3Sb5 is fundamental for understanding intertwined orders in the ground state
of kagome superconductors.
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