Journal
PHYSICAL REVIEW MATERIALS
Volume 7, Issue 10, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevMaterials.7.104201
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In this study, the stability of charge order in the kagome metal ScV6Sn6 is investigated. Short-range and long-range charge correlations at different wave vectors are observed, which are both quenched upon the introduction of larger Y ions. The results validate the theoretical prediction of the primary lattice instability and provide insights into the frustration of charge order in this compound.
Here we study the stability of charge order in the kagome metal ScV6Sn6. Synchrotron x-ray diffraction measurements reveal high-temperature, short-range charge correlations at the wave vectors along q = (1/3, 1/3, 1/2) whose interlayer correlation lengths diverge upon cooling. At the charge order transition, this divergence is interrupted, and long-range order freezes in along q = (1/3, 1/3, 1/3), as previously reported, while disorder enables the charge correlations to persist at the q = (1/3, 1/3, 1/2) wave vector down to the lowest temperatures measured. Both short-range and long-range charge correlations seemingly arise from the same instability and both are rapidly quenched upon the introduction of larger Y ions onto the Sc sites. Our results validate the theoretical prediction of the primary lattice instability at q = (1/3, 1/3, 1/2), and we present a heuristic picture for viewing the frustration of charge order in this compound.
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