Double-dome superconductivity under pressure in the V-based kagome metals <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>A</mml:mi><mml:msub><mml:mi mathvariant="normal">V</mml:mi><mml:mn>3</mml:mn></mml:msub><mml:msub><mml:mi>Sb</mml:mi><mml:mn>5</mml:mn></mml:msub></mml:mrow></mml:math> (<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>A</mml:mi><mml:mo>=</mml:mo><mml:mi>Rb</mml:mi></mml:mrow></mml:math> and K)
Caixia Zhu, Xiaofan Yang, W. Xia, Q. W. Yin, L. S. Wang, Chenhe Zhao, Dongzhe Dai, Chengpeng Tu, Boqin Song, Zicheng Tao, Z. J. Tu, Chunsheng Gong, Hechang Lei, Shiyan Li, Shiyan Li
Abstract
The kagome metals $A$V${}_{3}$Sb${}_{5}$ ($A$ = Cs, Rb, and K) host a wide range of exotic physics, including charge density wave, superconductivity, and topological state. Here, the authors present high-pressure resistance measurements on RbV${}_{3}$Sb${}_{5}$ and KV${}_{3}$Sb${}_{5}$. Two superconducting domes under pressure are unambiguously observed in both compounds, as they were previously observed in CsV${}_{3}$Sb${}_{5}$. The authors construct an integrated temperature-pressure phase diagram of $A$V${}_{3}$Sb${}_{5}$, showing that double-dome superconductivity under pressure is a common feature of these V-based kagome metals.