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Condensed Matter > Strongly Correlated Electrons
Title: Low temperature phase transitions under CDW state in kagome metals AV3Sb5 (A=Cs,Rb,K): Significance of mix-type Fermi surface electron correlations
(Submitted on 29 May 2023 (v1), last revised 4 Apr 2024 (this version, v5))
Abstract: 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.
Submission history
From: Jianxin Huang [view email][v1] Mon, 29 May 2023 13:37:50 GMT (2973kb)
[v2] Thu, 8 Jun 2023 09:34:35 GMT (1391kb)
[v3] Thu, 19 Oct 2023 07:52:50 GMT (1410kb)
[v4] Thu, 7 Dec 2023 13:23:32 GMT (1440kb)
[v5] Thu, 4 Apr 2024 12:34:53 GMT (1472kb)
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