Kagome superconductors AV3Sb5(A=Cs,V,Sb) have served as an ideal platform to unveil the intriguing competitions between charge-density-wave(CDW),superconductivity and possible nontrivial topological states.We report s...Kagome superconductors AV3Sb5(A=Cs,V,Sb) have served as an ideal platform to unveil the intriguing competitions between charge-density-wave(CDW),superconductivity and possible nontrivial topological states.We report soft point-contact spectroscopy(SPCS) studies on CsV3Sb5under pressure up to 2.5 GPa.Its superconducting transition temperature Tcand gaps for SPCS at pressure P=0.1 GPa suggest the absence of the adverse local strain effect as observed in point-contacts at ambient pressure,while the SPCS-determined Tcunder hydrostatic pressure deviates from the reported double dome feature below 2.5 GPa.Three distinct gap values in CsV3Sb5are proposed to exist through the whole pressure range with 2Δ1/kBTc≤1,2Δ2/kBTc~2.3-3.0 and 2Δ3/kBTc>3.5.The two smaller gaps for 2Δ1/kBTc≤1 and 2Δ2/kBTc~2.3-3.0 are robust under pressure,while there is no trace of the largest gap 2Δ3/kBTc>3.5 for SPCS in the c direction with P≤P1=0.7 GPa and P≥ P2=2.0 GPa and it becomes observable in the pressure range of(P1,P2),suggesting a complex relation between CDW and superconductivity between(P1,P2).展开更多
基金supported by the National Key R&D Program of China(Grant No. 2017YFA0303100)the National Natural Science Foundation of China (Grant Nos. 12174333, 11974061, and 12274369)the Key R&D Program of Zhejiang Province,China (Grant No. 2021C01002)。
文摘Kagome superconductors AV3Sb5(A=Cs,V,Sb) have served as an ideal platform to unveil the intriguing competitions between charge-density-wave(CDW),superconductivity and possible nontrivial topological states.We report soft point-contact spectroscopy(SPCS) studies on CsV3Sb5under pressure up to 2.5 GPa.Its superconducting transition temperature Tcand gaps for SPCS at pressure P=0.1 GPa suggest the absence of the adverse local strain effect as observed in point-contacts at ambient pressure,while the SPCS-determined Tcunder hydrostatic pressure deviates from the reported double dome feature below 2.5 GPa.Three distinct gap values in CsV3Sb5are proposed to exist through the whole pressure range with 2Δ1/kBTc≤1,2Δ2/kBTc~2.3-3.0 and 2Δ3/kBTc>3.5.The two smaller gaps for 2Δ1/kBTc≤1 and 2Δ2/kBTc~2.3-3.0 are robust under pressure,while there is no trace of the largest gap 2Δ3/kBTc>3.5 for SPCS in the c direction with P≤P1=0.7 GPa and P≥ P2=2.0 GPa and it becomes observable in the pressure range of(P1,P2),suggesting a complex relation between CDW and superconductivity between(P1,P2).
