Elastoresistivity and PEEM study of rotational symmetry breaking orders in the kagome metal CsCr₃Sb₅

The recently discovered kagome metal CsCr₃Sb₅, which is a Cr-based analogue of the extensively studied AV₃Sb₅, uniquely hosts coexisting charge density wave (CDW) and antiferromagnetic (AFM) orders. While these intertwined symmetry breakings have aroused interest, only a single transition at T* ≈ 55 K has been identified at ambient pressure, with its origin unresolved [1-4]. By employing elastoresistivity measurements and linear dichroic photoelectron emission microscopy (PEEM) measurements, we investigated rotational symmetry breaking natures in CsCr₃Sb₅. Our elastoresistivity measurements reveal an onset temperature of 64 K > T* for the rotational symmetry breaking. We also present that three-state domains are visualized below T* in PEEM measurements, showing a striking dichotomy of the previously reported charge and magnetic orders in CsCr₃Sb₅.



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[3] Y. Li et al. Electron correlation and incipient flat bands in the Kagome superconductor CsCr3Sb5. Nat. Commun. 16, 3229 (2025).

[4] W. Yao et al. Absence of Acoustic Phonon Anomaly in a Kagome Metal with Short-ranged Structural Modulation. arXiv:2410.16465 (2024).