Electron-Correlation-Assisted Charge Stripe Order in a Kagome Superconductor
Linwei Huai, Zhuying Wang, Huachen Rao, Yulei Han, Bo Liu, Shuikang Yu, Yunmei Zhang, Ruiqing Zang, Runqing Luan, Shuting Peng, Zhenhua Qiao, Zhenyu Wang, Junfeng He, Tao Wu, Xianhui Chen
DOI 10.1103/hfkr-k2pw · Physical Review X
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Abstract
A central mystery in high-temperature cuprate superconductors is the coexistence of multiple exotic orders, which is presumably associated with strong electronic correlation. The ongoing interest in this enigmatic phenomenon is further energized when similar electronic orders and states emerge and coexist in less correlated kagome superconductors. Here, by utilizing angle-resolved photoemission spectroscopy (ARPES), nuclear magnetic resonance (NMR) spectroscopy, scanning tunneling microscopy (STM) and first-principles calculations, we reveal the sudden emergence of a distinct short-range charge stripe order in Sn-doped CsV3Sb5 kagome superconductors when the long-range 2×2 charge density wave order in pristine CsV3Sb5 is suppressed. This short-range stripe order features a modulation vector of approximately 1/3 along one of the three lattice directions, induces remarkable quasiparticle scattering between the original quasi-1D kagome d bands and their replica of folding, and clearly suppresses the electron density of states at the Fermi level. Our first-principles calculations reveal that 3×1 supermodulation represents a hidden secondary instability in pristine CsV3Sb5. This instability is further enhanced by in-plane chemical pressure induced by Sn substitution, and coupled to the electronic correlation, leading to a unique charge stripe order in the system. As such, our results reveal a new route toward emergent electronic orders via cooperative interactions between the lattice and electronic degrees of freedom.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| CsV3Sb5-xSnx Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| CsV3Sb5 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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