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Nodeless electron pairing in CsV3Sb5-derived kagome superconductors
Yigui Zhong1, Jinjin Liu2,3, Xianxin Wu4
1Institute for Solid States Physics, The University of Tokyo, Kashiwa, Japan.
Nature
|April 26, 2023
Summary
Researchers observed a consistent, nodeless superconducting gap in CsV3Sb5 kagome superconductors. This finding clarifies electron pairing symmetry, advancing understanding of quantum materials with intertwined electronic orders.
Area of Science:
- Condensed Matter Physics
- Quantum Materials Science
Background:
- Kagome superconductors, such as CsV3Sb5, are crucial for studying the complex interplay of band topology, electronic order, and lattice geometry.
- The precise nature of the superconducting ground state and electron pairing symmetry in these materials remains poorly understood due to limited momentum-resolved measurements.
Purpose of the Study:
- To directly observe and characterize the superconducting gap structure in momentum space for CsV3Sb5-derived kagome superconductors.
- To elucidate the electron pairing symmetry and its relationship with charge order in these quantum materials.
Main Methods:
- Utilizing ultrahigh-resolution and low-temperature angle-resolved photoemission spectroscopy (ARPES).
- Investigating Cs(V0.93Nb0.07)3Sb5 and Cs(V0.86Ta0.14)3Sb5, which are exemplary CsV3Sb5-derived kagome superconductors.
Main Results:
- Direct observation of a nodeless, nearly isotropic, and orbital-independent superconducting gap in the momentum space of the studied kagome superconductors.
- The observed superconducting gap structure is robust and unaffected by the presence or absence of charge order, which can be tuned by Nb/Ta substitution.
Conclusions:
- The findings provide crucial, momentum-resolved information on the electron pairing symmetry in kagome superconductors.
- This study advances the fundamental understanding of superconductivity and intertwined electronic orders in complex quantum materials.
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