A nematic phase breaks the point-group symmetry of the crystal lattice and is known to emerge in correlated materials. Here we report the observation of an intra-unit-cell nematic order and associated Fermi surface deformation in the kagome metal ScV₆Sn₆. Using scanning tunnelling microscopy and scanning tunnelling spectroscopy, we reveal a stripe-like nematic order breaking the crystal rotational symmetry within the kagome lattice itself. Moreover, we identify a set of Van Hove singularities adhering to the kagome-layer electrons, which appear along one direction of the Brillouin zone and are annihilated along other high-symmetry directions, revealing rotational symmetry breaking. Via detailed spectroscopic maps, we further observe an elliptical deformation of the Fermi surface, which provides direct evidence for an electronically mediated nematic order. Our work not only bridges the gap between electronic nematicity and kagome physics but also sheds light on the potential mechanism for realizing symmetry-broken phases in correlated electron systems.

向列相打破了晶格的点群对称性，并且已知出现在相关材料中。在这里，我们报告了 kagome 金属 ScV ₆ Sn ₆中晶胞内向列序和相关费米表面变形的观察。使用扫描隧道显微镜和扫描隧道光谱，我们揭示了一种条状向列序，打破了 kagome 晶格本身的晶体旋转对称性。此外，我们还发现了一组附着在戈薇层电子上的范霍夫奇点，这些奇点沿着布里渊区的一个方向出现，并沿着其他高对称方向湮灭，揭示了旋转对称性破缺。通过详细的光谱图，我们进一步观察到费米面的椭圆形变形，这为电子介导的向列序提供了直接证据。我们的工作不仅弥合了电子向列性和戈薇物理之间的差距，而且还揭示了在相关电子系统中实现对称破缺相的潜在机制。