# Impact of the orbital current order on the superconducting properties of the kagome superconductors

## TL;DR

This paper investigates how chiral flux charge order influences the superconducting and normal state properties of kagome superconductors, revealing momentum-dependent gaps and a transition from fully gapped to nodal superconductivity, aligning with recent experiments.

## Contribution

It provides a theoretical analysis of the impact of chiral flux charge order on superconducting properties, explaining experimental observations of gap structures and pairing symmetry.

## Key findings

- Spectral weight on the Fermi surface is partially gapped by chiral flux charge order.
- A fully gapped superconducting state evolves into a nodal gap due to charge order.
- Density of states transitions from U-shaped to V-shaped, matching experimental data.

## Abstract

Motivated by recent experimental evidences signalling the chiral charge order in the vanadium-based kagome superconductors, we theoretically investigate the impact of the chiral flux charge order over the experimental outcomes for the normal and the SC properties. It is revealed that the spectral weight on the Fermi surface (FS) is partially gaped by the chiral flux charge order with the reservation of the spectral weight on the $M$ points and the midpoint between the two adjacent $M$ points, resulting in the momentum-dependent energy gap being consistent with the recent experimental observations. More importantly, by considering the influence of the chiral flux charge order, we find that a conventional fully gapped SC pairing state evolves into a nodal gap feature for the spectral weight due to the spectral gap modulations on the FS. As a result, the U-shaped density of states (DOS) deforms to the V-shaped one along with the residual DOS near the Fermi energy. These results bear some resemblance to the experimental observations, and may serve as a promising proposal to mediate the divergent or seemingly contradictory experimental outcomes about the SC pairing symmetry.