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journal article·2023-05-11Open access

Commensurate-to-incommensurate transition of charge-density-wave order and a possible quantum critical point in pressurized kagome metal CsV3Sb5

X. Y. Feng, Z. Zhao, J. Luo, J. Yang, A. F. Fang, H. T. Yang, H. J. Gao, R. Zhou, Guo-qing Zheng

npj Quantum Materials· Volume 8· Issue 1
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Abstract

Abstract Clarifying the interplay between charge-density waves (CDWs) and superconductivity is important in the kagome metal CsV3Sb5, and pressure (P) can play a crucial role. Here, we present121/123Sb nuclear quadrupole resonance (NQR) measurements under hydrostatic pressures up to 2.43 GPa in CsV3Sb5single crystals. We demonstrate that the CDW gradually changes from a commensurate modulation with a star-of-David (SoD) pattern to an incommensurate one with a superimposed SoD and Tri-hexagonal (TrH) pattern stacking along thec-axis. Moreover, the linewidthδνof121/123Sb-NQR spectra increases with cooling down toTCDW, indicating the appearance of a short-range CDW order due to CDW fluctuations pinned by quenched disorders. Theδνshows a Curie–Weiss temperature dependence and tends to diverge atPc ~ 1.9 GPa, suggesting that a CDW quantum critical point (QCP) exists atPcwhereTcshows the maximum. ForP > Pc, spin fluctuations are enhanced when the CDW is suppressed. Our results suggest that the maximalTcatPc ~ 1.9 GPa is related to the CDW QCP, and the presence of spin fluctuations prevents theTcfrom a rapid decrease otherwise, after the CDW is completely suppressed.
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OpenAlex topics: Advanced Condensed Matter Physics · Physics of Superconductivity and Magnetism · Iron-based superconductors research

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