| Autor: |
X. Y. Feng, Z. Zhao, J. Luo, J. Yang, A. F. Fang, H. T. Yang, H. J. Gao, R. Zhou, Guo-qing Zheng |
| Jazyk: |
angličtina |
| Rok vydání: |
2023 |
| Předmět: |
|
| Zdroj: |
npj Quantum Materials, Vol 8, Iss 1, Pp 1-7 (2023) |
| Druh dokumentu: |
article |
| ISSN: |
2397-4648 |
| DOI: |
10.1038/s41535-023-00555-w |
| Popis: |
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 present 121/123Sb nuclear quadrupole resonance (NQR) measurements under hydrostatic pressures up to 2.43 GPa in CsV3Sb5 single 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 the c-axis. Moreover, the linewidth δ ν of 121/123Sb-NQR spectra increases with cooling down to T CDW, indicating the appearance of a short-range CDW order due to CDW fluctuations pinned by quenched disorders. The δ ν shows a Curie–Weiss temperature dependence and tends to diverge at P c ~ 1.9 GPa, suggesting that a CDW quantum critical point (QCP) exists at P c where T c shows the maximum. For P > P c, spin fluctuations are enhanced when the CDW is suppressed. Our results suggest that the maximal T c at P c ~ 1.9 GPa is related to the CDW QCP, and the presence of spin fluctuations prevents the T c from a rapid decrease otherwise, after the CDW is completely suppressed. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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