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| Hauptverfasser: | , , , , , , , , , |
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| Format: | Preprint |
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2026
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| Online-Zugang: | https://arxiv.org/abs/2603.20459 |
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| _version_ | 1866908903346798592 |
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| author | Zhao, Boyang Ahn, Youngjun Deng, Qinwen Liu, Yidai Xu, Sijie Walko, Donald A. Hruszkewycz, Stephan O. Dai, Pengcheng Wu, Liang Wen, Haidan |
| author_facet | Zhao, Boyang Ahn, Youngjun Deng, Qinwen Liu, Yidai Xu, Sijie Walko, Donald A. Hruszkewycz, Stephan O. Dai, Pengcheng Wu, Liang Wen, Haidan |
| contents | 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 coexisting charge density wave (CDW) and antiferromagnetic orders, accompanied by a lattice distortion associated with partial Ge-Ge dimerization. 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 constants at the CDW transition temperature TCDW, providing direct evidence for a first-order structural phase transition that is absent in samples with suppressed CDW order. Furthermore, the long-range CDW order was found to be only commensurate with lattice structures with the compressed out-of-plane lattice constant. The Landau free energy analysis shows that strong lattice-charge coupling is a key factor in stabilizing long-range CDW order. Our work clarifies the critical role of structural transformation in the CDW formation and opens opportunities for strain control of electronic phases in FeGe. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_20459 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Structural Phase Separation Couples to Charge-Density-Wave Formation in Kagome Metal FeGe Zhao, Boyang Ahn, Youngjun Deng, Qinwen Liu, Yidai Xu, Sijie Walko, Donald A. Hruszkewycz, Stephan O. Dai, Pengcheng Wu, Liang Wen, Haidan Materials Science 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 coexisting charge density wave (CDW) and antiferromagnetic orders, accompanied by a lattice distortion associated with partial Ge-Ge dimerization. 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 constants at the CDW transition temperature TCDW, providing direct evidence for a first-order structural phase transition that is absent in samples with suppressed CDW order. Furthermore, the long-range CDW order was found to be only commensurate with lattice structures with the compressed out-of-plane lattice constant. The Landau free energy analysis shows that strong lattice-charge coupling is a key factor in stabilizing long-range CDW order. Our work clarifies the critical role of structural transformation in the CDW formation and opens opportunities for strain control of electronic phases in FeGe. |
| title | Structural Phase Separation Couples to Charge-Density-Wave Formation in Kagome Metal FeGe |
| topic | Materials Science |
| url | https://arxiv.org/abs/2603.20459 |