Here, we report a scanning tunneling microscopy study on an $s$-wave superconductor NaAlSi, revealing the coexistence of stripe order and superconductivity. This stripe order manifests as a unidirectional spatial charge modulation with a commensurate period of four times the lattice constant. This modulation undergoes a phase shift in the differential conductance maps under opposite bias voltages, while its period remains approximately constant over an energy range of $\pm 50\mathrm{meV}$. These features suggest that this stripe is likely a static charge order. Furthermore, we find that the stripe order imposes a periodic modulation on the intensity of the superconducting coherence peaks. This work provides interesting perspectives on the intricate interplay between stripe order and $s$-wave superconductivity.

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• Electronic structure
• Stripes
• Superconductivity
• Superconductors
• Scanning tunneling microscopy
• Scanning tunneling spectroscopy