Authors
Boyang Zhao, Youngjun Ahn, Qinwen Deng, Yidai Liu, Sijie Xu, Donald A Walko, Stephan O Hruszkewycz, Pengcheng Dai, Liang Wu, Haidan Wen
Published in
Physical review letters. Volume 137. Issue 14. Pages 146102. Oct 02, 2026.
Abstract
The intertwining of charge, spin, and lattice degrees of freedom underlies the emergent properties of correlated materials. A recent prominent example is the kagome metal FeGe, which hosts a charge density wave (CDW) within a preexisting antiferromagnetic state. Although partial Ge-Ge dimerization is known to accompany CDW formation, the thermodynamic pathway through which long-range CDW order emerges remains unclear. Using temperature-dependent high-resolution x-ray diffraction measurements, we observed a robust splitting of the lattice reflection into two coexisting peaks with distinct lattice parameters in FeGe crystals exhibiting long-range CDW order at the CDW transition temperature. In addition, the long-range CDW order emerges concurrently and remains commensurate with a structural phase characterized by the smaller out-of-plane lattice parameter. Our observation provides direct evidence for a first-order structural phase transition coupled to long-range CDW order, which is absent in samples exhibiting short-range CDW order. A Landau model shows that strong charge-lattice coupling is a key factor in stabilizing the long-range CDW order. Our Letter reveals that the first-order structural phase transition is crucial for stabilizing long-range CDW order, suggesting lattice strain as a tuning parameter for controlling intertwined electronic states in kagome metals.
PMID:
42886913
Bibliographic data and abstract were imported from PubMed on 17 Oct 2026.
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