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Abstract
Abstract The interplay between 2a0 × 2a0 charge density wave (CDW), nematicity and superconductivity in AV3Sb5 (A = K, Rb, Cs) compounds gives rise to a rich landscape of intriguing physical phenomena. In addition to the 2a0 × 2a0 CDW, a unidirectional 4a0 stripe CDW is also observed on the Sb surface of RbV3Sb5 and CsV3Sb5. However, reports of stripe-like CDWs in KV3Sb5 have been limited. Here, we report the first observation of a long-range unidirectional stripe order with a 6a0 modulation period on the Sb surface of KV3Sb5, coexisting with the 2a0 × 2a0 CDW. Notably, the intensity of the 6a0 stripes in STM topographies exhibits pronounced contrast reversal between opposite bias voltages. Additionally, the wave vector of the 6a0 modulation show no energy-dependent dispersing, confirming its CDW origin. Furthermore, the 6a0 CDW is robust under a 7 T out-of-plane magnetic field and persists over a temperature range from 215 mK to 720 mK. These results provide compelling evidence for the emergence of a long-range unidirectional CDW in KV3Sb5.
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