  The recently discovered kagome superconductors offer a promising platform for
investigating intertwined orders and novel states, including topology,
superconductivity, charge density waves, and more. The interplay among these
orders can spontaneously break rotational symmetry, giving rise to exotic
phenomena such as nematicity or even nematic superconductivity. Here we present
our findings on the two-fold symmetric superconductivity in thin-flake RbV3Sb5
in response to direction-dependent in-plane magnetic fields, in contrast to the
inherent six-fold structural symmetry of the crystal lattice. The two-fold
symmetry was evidenced through a combination of magnetoresistance transport
experiments, critical magnetic field measurements, and observations of
anisotropic superconducting gaps. Additionally, by altering the experimental
configuration, we also detected the presence of six-fold symmetric components
superimposed on the two-fold symmetry at the boundary between normal and
superconducting states. Our results underscore the correlation-driven
symmetry-breaking phenomena and emphasize the potential of this correlated
kagome family as a promising platform for investigating intertwined orders,
including unconventional superconductivity.
