Switchable chiral pair density wave in pure <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msub> <mml:mi>CsV</mml:mi> <mml:mn>3</mml:mn> </mml:msub> <mml:msub> <mml:mi>Sb</mml:mi> <mml:mn>5</mml:mn> </mml:msub> </mml:mrow>

We investigate electron pairing in a super clean kagome superconductor CsV3Sb5 with a residual resistivity ratio (RRR) of 290. By using the dilution-refrigerator-based scanning tunneling microscopy (STM) at the Synergetic Extreme Condition User Facility (SECUF), we find that the pairing gap exhibits chiral 2x2 modulations, and their chirality can be controlled by magnetic field training. We introduce nonmagnetic impurities to observe the complete suppression of 2x2 pairing modulations in presence of persistent 2x2 charge order. This nonmagnetic pair-breaking effect provides phase-sensitive evidence for pair-density-wave (PDW) induced pairing modulations. Our results support switchable chiral 2x2 PDW in this super clean kagome superconductor.

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Journal
Physical review. B./Physical review. B
Published
2026-02-17
DOI
https://doi.org/10.1103/j98r-9m59
Primary Topic
High-pressure geophysics and materials
Type
article
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Switchable chiral pair density wave in pure <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msub> <mml:mi>CsV</mml:mi> <mml:mn>3</mml:mn> </mml:msub> <mml:msub> <mml:mi>Sb</mml:mi> <mml:mn>5</mml:mn> </mml:msub> </mml:mrow>

Jia‐Xin Yin, Chao Yan. Muwei Gao, Wei Song, Desheng Wu et al.
Physical review. B./Physical review. B
High-pressure geophysics and materials
article

Switchable chiral pair density wave in pure <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msub> <mml:mi>CsV</mml:mi> <mml:mn>3</mml:mn> </mml:msub> <mml:msub> <mml:mi>Sb</mml:mi> <mml:mn>5</mml:mn> </mml:msub> </mml:mrow>

Jia‐Xin Yin, Chao Yan. Muwei Gao, Wei Song, Desheng Wu, Hanbin Deng, Zhiwei Wang, Guowei Liu, Xiao-Yu Yan, Xin Yu, Hailang Qin, Rui Wu, Deng Hu
article en

Abstract

We investigate electron pairing in a super clean kagome superconductor CsV3Sb5 with a residual resistivity ratio (RRR) of 290. By using the dilution-refrigerator-based scanning tunneling microscopy (STM) at the Synergetic Extreme Condition User Facility (SECUF), we find that the pairing gap exhibits chiral 2x2 modulations, and their chirality can be controlled by magnetic field training. We introduce nonmagnetic impurities to observe the complete suppression of 2x2 pairing modulations in presence of persistent 2x2 charge order. This nonmagnetic pair-breaking effect provides phase-sensitive evidence for pair-density-wave (PDW) induced pairing modulations. Our results support switchable chiral 2x2 PDW in this super clean kagome superconductor.

Physical review. B./Physical review. BVol. 113(12)
Beijing Institute of Technology (CN), Chinese Academy of Sciences (CN), Southern University of Science and Technology (CN), FZU ‒ Institute of Physics of the Academy of Sciences of the Czech Republic (CZ), Quantum Science Center of Guangdong-Hong Kong-Macao Greater Bay Area (CN)
Openalex Percentile: Top 100%
High-pressure geophysics and materials
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