Switchable chiral pair density wave in pure CsV3Sb5
Wei Song, Xiao-Yu Yan, Xin Yu, Desheng Wu, Deng Hu, Hailang Qin, Guowei Liu, Hanbin Deng, Chao Yan, Muwei Gao, Zhiwei Wang, Rui Wu, Jia-Xin Yin
DOI 10.1103/j98r-9m59 · Physical Review B
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Abstract
We investigate electron pairing in a super clean kagome superconductor CsV3Sb5 with a residual resistivity ratio (RRR) of 290. 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 2 × 2 modulations, and their chirality can be controlled by magnetic field training. We introduce nonmagnetic impurities to observe the complete suppression of 2 × 2 pairing modulations in presence of persistent 2 × 2 charge order. This nonmagnetic pair-breaking effect provides phase-sensitive evidence for pair-density-wave (PDW)-induced pairing modulations. Our results support switchable chiral 2 × 2 PDW in this super clean kagome superconductor.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| CsV3Sb5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3 | Pressure unresolved | onset |
| CsV3Sb5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3 | Pressure unresolved | unknown |
| CsV3Sb5-xNbx Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4.4 | Pressure unresolved | onset |
| CsV3Sb5-xNbx Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4.4 | Pressure unresolved | unknown |
| KV3Sb5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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