Low temperature phase transitions under CDW state in kagome metals AV3Sb5 (A=Cs,Rb,K): Significance of mix-type Fermi surface electron correlations
In: Phys. Rev. B 109, L041110 (2024); (2023)
Online
report
To understand the multistage phase transitions in V-based kagome metals inside the charge-density-wave (CDW) phase, we focus on the impact of the "mix-type" Fermi surface because it is intact in the CDW state on the "pure-type" Fermi surface. On the mixed-type Fermi surface, moderate spin correlations develop, and we reveal that uniform (q=0) bond order is caused by the paramagnon interference mechanism, which is described by the Aslamazov-Larkin vertex correction. A dominant solution is the E2g-symmetry nematic order, in which the director can be rotated arbitrarily. In addition, we obtain the A1g-symmetry non-nematic order, which leads to the change in the lattice constants without symmetry breaking. The predicted E2g and A1g channel fluctuations at q=0 can be observed by the elastoresistance measurements. These results are useful to understand the multistage phase transitions inside the 2 $\times$ 2 CDW phase. The present theory has a general significance because mix-type band structure universally exists in various kagome lattice models.
Comment: 7 pages,5 figures
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Low temperature phase transitions under CDW state in kagome metals AV3Sb5 (A=Cs,Rb,K): Significance of mix-type Fermi surface electron correlations
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Autor/in / Beteiligte Person: | Huang, Jianxin ; Tazai, Rina ; Yamakawa, Youichi ; Onari, Seiichiro ; Kontani, Hiroshi |
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Quelle: | Phys. Rev. B 109, L041110 (2024); (2023) |
Veröffentlichung: | 2023 |
Medientyp: | report |
DOI: | 10.1103/PhysRevB.109.L041110 |
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