Competition between charge-density-wave and superconductivity in the kagome metal <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>Rb</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>
Ningning Wang, Keyu Chen, Q. W. Yin, Y. N. N., B. Y. Pan, Xiaofan Yang, Xiaoguang Ji, Siqi Wu, Pengfei Shan, Shuxiang Xu, Z. J. Tu, Chunsheng Gong, G. T. Liu, G. Li, Yoshiya Uwatoko, Xiaoli Dong, Hechang Lei, Jianping Sun, Jinguang Cheng
Abstract
The interplay between charge-density-wave (CDW) order and superconductivity (SC) in the kagome metal RbV 3 Sb 5 is studied by tracking the evolutions of their transition temperatures T * and T c as a function of pressure (P) via measurements of resistivity and magnetic susceptibility under various hydrostatic pressures up to 5 GPa. It is found that the CDW order at T * experiences a subtle modification at P c1 1.5 GPa before it is completely suppressed around P c2 2.4 GPa. Accordingly, the superconducting transition T c (P) exhibits a shallow M-shaped double superconducting dome with two extrema of T onset c 4.4 and 3.9 K around P c1 and P c2 , respectively, leading to a fourfold enhancement of T c with respect to that at ambient pressure. The constructed T-P phase diagram of RbV 3 Sb 5 resembles that of CsV 3 Sb 5 and shares similar features to many other unconventional superconducting systems with intertwined competing electronic orders. The strong competition between CDW and SC is also evidenced by the broad superconducting transition width in the coexistent region. Our results shed more light on the intriguing physics involving intertwined electronic orders in this topological kagome metal family.