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arXiv · 2608.29142

Evolving charge order in the CDW state of AV$_3$Sb$_5$ metals

Anshu Kataria·Francis Pratt·Peter J. Baker·Stephen Cottrell·Miki Bonacci·Andrea Capa Salinas·Stephen D. Wilson·Zurab Guguchia·Samuele Sanna·Pietro Bonfà
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Abstract

AV$_3$Sb$_5$ kagome metals are characterized by intertwined electronic and structural orders, which motivated extensive studies in recent years. Yet the details of the electronic state preceding the superconducting phase remain poorly understood. Here we extend our previous investigation [Phys. Rev. Research 7, L032046 (2025)] of RbV$_3$Sb$_5$ using avoided level crossing (ALC) muon-spin spectroscopy to the $A$ = Cs and K systems. Consistent with our previous study, we identify a second transition whose origin cannot be attributed solely to an internal magnetic field, indicating the involvement of an additional electronic mechanism that subtly modifies the charge distribution within the V plane. In particular, the ALC results point towards an additional charge modulation taking place within the charge density wave (CDW) phase and occurring at $T^{*}<T_{CDW}$ for $A$ = Cs and Rb, or in the vicinity of $T_{CDW}$ for $A$ = K.

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Anshu Kataria, Francis Pratt, Peter J. Baker, Stephen Cottrell, Miki Bonacci, Andrea Capa Salinas, Stephen D. Wilson, Zurab Guguchia, Samuele Sanna, Pietro Bonfà. 2026-08-29. Evolving charge order in the CDW state of AV$_3$Sb$_5$ metals. https://arxiv.org/abs/2608.29142

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