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To understand the multistage phase transitions in V-based kagome metalsinside 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 mix-type Fermi surface, moderate spincorrelations develop, and we reveal that uniform (q=0) bond order is caused bythe paramagnon interference mechanism, which is described by theAslamazov-Larkin vertex correction. A dominant solution is the E2g-symmetrynematic 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 thelattice constants without symmetry breaking. The predicted E2g and A1g channelfluctuations at q=0 can be observed by the elastoresistance measurements. Theseresults are useful to understand the multistage phase transitions inside the 2$\times$ 2 CDW phase. The present theory has a general significance becausemix-type band structure universally exists in various kagome lattice models.

Low temperature phase transitions under CDW state in kagome metals AV3Sb5 (A=Cs,Rb,K): Significance of mix-type Fermi surface electron correlations