Possible star-of-David pattern charge density wave with additional modulation in the kagome superconductor CsV3Sb5

• Published in: npj quantum materials Vol. 7; no. 1; pp. 1 - 7
• Main Authors: Luo, J., Zhao, Z., Zhou, Y. Z., Yang, J., Fang, A. F., Yang, H. T., Gao, H. J., Zhou, R., Zheng, Guo-qing
• Format: Journal Article
• Language: English
• Published: London Nature Publishing Group UK 18-03-2022; Nature Publishing Group; Nature Portfolio
• Subjects: 639/766/119/1003; 639/766/119/995; Charge density waves; Condensed Matter Physics; Modulation; NMR; Nuclear magnetic resonance; Nuclear quadrupole resonance; Physics; Physics and Astronomy; Quadrupoles; Quantum Physics; Structural Materials; Superconductivity; Surfaces and Interfaces; Thin Films; Transition temperature
• ISSN: 2397-4648; 2397-4648
• DOI: 10.1038/s41535-022-00437-7

A
V
3
Sb
5
(
A
 = K, Rb, Cs) is a novel kagome superconductor coexisting with the charge density wave (CDW) order. Identifying the structure of the CDW order is crucial for understanding the exotic normal state and superconductivity in this system. Here, we report
51
V nuclear magnetic resonance (NMR) and
121/123
Sb nuclear quadrupole resonance (NQR) studies on kagome-metal CsV
3
Sb
5
. Below the CDW transition temperature
T
CDW
 ~ 98 K, an abrupt change of spectra was observed, indicating that the transition is of the first order. By further analyzing the spectra, we find that the CDW order is commensurate. And most remarkably, the obtained experimental results suggest that the charge modulation of the CDW order is of star-of-David pattern and accompanied by an additional charge modulation in bulk below
T
*
 ~ 40 K. Our results revealing the unconventional CDW order provide new insights into
A
V
3
Sb
5
.