Evolution of superconductivity and charge order in pressurized RbV₃Sb₅

【摘要】 The kagome metals AV₃ Sb₅（A=K,Rb,Cs） under ambient pressure exhibit an unusual charge order,from which superconductivity emerges.In this work,by applying hydrostatic pressure using a liquid pressure medium and carrying out electrical resistance measurements for RbV₃ Sb₅,we find that the charge order becomes suppressed under a modest pressure p_c（1.4 GPa<p_c<1.6 GPa）,while the superconducting transition temperature T_c is maximized.T_c is then gradually weakened with further increase of pressure and reaches a minimum around 14.3 GPa,before exhibiting another maximum around 22.8 GPa,signifying the presence of a second superconducting dome.Distinct normal state resistance anomalies are found to be associated with the second superconducting dome,similar to KV₃ Sb₅.Our findings point to qualitatively similar temperature-pressure phase diagrams in KV₃ Sb₅ and RbV₃ Sb₅,and suggest a close link between the second superconducting dome and the high-pressure resistance anomalies.更多还原

【Abstract】 The kagome metals AV₃ Sb₅（A=K,Rb,Cs） under ambient pressure exhibit an unusual charge order,from which superconductivity emerges.In this work,by applying hydrostatic pressure using a liquid pressure medium and carrying out electrical resistance measurements for RbV₃ Sb₅,we find that the charge order becomes suppressed under a modest pressure p_c（1.4 GPa<p_c<1.6 GPa）,while the superconducting transition temperature T_c is maximized.T_c is then gradually weakened with further increase of pressure and reaches a minimum around 14.3 GPa,before exhibiting another maximum around 22.8 GPa,signifying the presence of a second superconducting dome.Distinct normal state resistance anomalies are found to be associated with the second superconducting dome,similar to KV₃ Sb₅.Our findings point to qualitatively similar temperature-pressure phase diagrams in KV₃ Sb₅ and RbV₃ Sb₅,and suggest a close link between the second superconducting dome and the high-pressure resistance anomalies.更多还原