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Most superconductors have an isotropic, single component order parameter, andare well described by the BCS theory for superconductivity. Unconventional,multiple components superconductors are exceptionally rare and are much lessunderstood. Here, we combine scanning tunneling microscopy and angle-resolvedmacroscopic transport to study the candidate chiral superconductor,4Hb-TaS$_2$. We reveal quasi-periodic one-dimensional modulations in thetunneling conductance accompanied by two-fold symmetric superconductingcritical field. The strong modulation of the in-plane critical field, points toa nematic, unconventional order parameter. However, the imaged vortex core isnearly circular symmetric, suggesting an isotropic order parameter. Wereconcile this apparent discrepancy by modeling a competition between adominating chiral superconducting order parameter and a nematic one, the latteremerges close to the normal phase. Our results strongly support the existenceof two-component superconductivity in 4Hb-TaS$_2$ and can provide usefulinsights to other systems with coexistent charge order and superconductivity.

Chiral to Nematic Crossover in the Superconducting State of 4Hb-TaS$_2$