Competitive charge density waves in the doped kagome superconductor CsV3−xTixSb5
Zhimian Wu, Kuanglv Sun, Hongyu Li, Linpeng Nie, Huachen Rao, Dan Zhao, Ziji Xiang, Jianjun Ying, Zhenyu Wang, Tao Wu, Xianhui Chen
DOI 10.1103/ls5k-8q3d · Physical Review B
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Abstract
Unconventional charge density waves (CDWs) have been observed in the kagome superconductor AV3Sb5 (A=K, Rb, or Cs), which exhibit extraordinary symmetry breaking and intertwine with superconductivity (SC). Here, via V51 nuclear magnetic resonance (NMR), we reveal that a new CDW modulation is developed locally around dopants in CsV3−xTixSb5, which leads to the suppression of the long-range triple-Q CDW. With slight Ti substitution (x<0.09), a rapid increase in Knight shift and a progressive decrease in 1/T1T are observed, which is beyond the simple picture of the suppression of the triple-Q CDW. Above x=0.12, while the CDW transition is absent in specific heat measurements, a gap behavior is still observed in the local spin susceptibilities. By quantitatively analyzing the doping-dependent NMR line shape and 1/T1T, we propose that a competitive CDW with unidirectional modulation is locally formed around Ti dopants, which is key to explaining the unusual evolution of the CDW and SC in CsV3−xTixSb5. In this picture, the persisting gap behavior above x=0.12 comes from the short-range CDW matrix. In addition, our present NMR results highlight the role of the next-nearest-neighboring V-V interaction in CDW driving. All these findings substantiate vanadium-based kagome superconductors as strongly coupled electron-lattice systems, which is a basis for understanding unconventional CDWs and their role in SCs.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| CsV3-xTixSb5 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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