Origin of enhanced charge density wave in the kagome superconductor CsV3−xMoxSb5
Jiangpeng Song, Tao Han, Zekun Zhou, Qingge Mu, Xingyuan Hou, Zongyuan Zhang, Yubing Tu, Lei Shan
DOI 10.1103/PhysRevB.110.054518 · Physical Review B
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Abstract
The topological kagome superconductor CsV3Sb5 exhibits rich quantum phenomenology of correlated electronic phases including unconventional charge order and superconductivity. Understanding how the singularities inherent to the kagome lattice are linked to the observed many-body phases is a topic of great interest. Here, by using Shubnikov–de Haas oscillation measurements, we report the detailed evolution of electronic band structures in CsV3−xMoxSb5 single crystals, where Mo substitution causes a suppression of superconductivity and an enhanced charge density wave. The obvious decrease of oscillation frequency (Fβ) corresponding to the nontrivial band from 72 to 59 T and smaller cyclotron effective mass (∼0.069me) reveal that the van Hove singularities from the vanadium orbitals near M are abnormally lifted and promote the nesting condition for the charge density wave. Meanwhile, the electric conduction changes from a hole-dominated multiband feature to a single electron band feature and the anomalous Hall effect becomes stronger. In conjunction with the simple schematics of band structures, the promoted Fermi-surface nesting is dominant in the unusual enhanced charge density wave, offering insight to comprehend the delicate interaction between the intertwined orders in this kagome system.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| CsV3Sb5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.72 | Pressure not reported | zero_resistance |
| CsV3-xMoxSb5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.1 | Pressure not reported | onset |
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