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Fabrication of new types of superconductors with novel physical propertieshas always been a major thread in the research of superconducting materials. Anexample is the enormous interests generated by the cascade of correlatedtopological quantum states in the newly discovered vanadium-based kagomesuperconductors AV3Sb5 (A=K, Rb, and Cs) with a Z2 topological band structure.Here we report the successful fabrication of single-crystals of titanium-basedkagome metal CsTi3Bi5 and the observation of superconductivity and electronicnematicity. The onset of the superconducting transition temperature Tc isaround 4.8 K. In sharp contrast to the charge density wave superconductorAV3Sb5, we find that the kagome superconductor CsTi3Bi5 preserves translationsymmetry, but breaks rotational symmetry and exhibits an electronic nematicity.The angular-dependent magnetoresistivity shows a remarkable two-fold rotationalsymmetry as the magnetic field rotates in the kagome plane. The scanningtunneling microscopy and spectroscopic imaging detect rotational-symmetrybreaking C2 quasiparticle interference patterns (QPI) at low energies,providing further microscopic evidence for electronic nematicity. Combined withfirst-principle calculations, we find that the nematic QPI is orbital-selectiveand dominated by the Ti dxz and dyz orbitals, possibly originating from theintriguing orbital bond nematic order. Our findings in the new "135" materialCsTi3Bi5 provide new directions for exploring the multi-orbital correlationeffect and the role of orbital or bond order in the electron liquid crystalphases evidenced by the symmetry breaking states in kagome superconductors.

Superconductivity and orbital-selective nematic order in a new titanium-based kagome metal CsTi3Bi5