上海科技大学知识管理系统

We present high-pressure resistance measurements up to 40 GPa on recently discovered titanium-based kagome metal CsTi3Bi5. At ambient pressure, CsTi3Bi5 shows no evidence of superconductivity in resistivity and specific heat. By applying pressure, superconductivity emerges and the superconducting transition temperature Tc reaches its first maximum of 1.2 K at ∼5 GPa. Then the Tc is suppressed by pressure and cannot be detected around 10 GPa, manifesting as a superconducting dome. Remarkably, upon further increasing pressure above ∼13 GPa, another superconducting dome shows up, with the maximum Tc of 0.6 K and ending pressure at ∼36 GPa. The variation of Tc displays a clear double-dome shape in the superconducting phase diagram. Our work demonstrates the similarity between CsTi3Bi5 and CsV3Sb5, providing valuable insights into the rich physics of these novel kagome metals.