Double Superconducting Dome and Triple Enhancement ofTcin the Kagome SuperconductorCsV3Sb5under High Pressure,Physical Review Letters

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Double Superconducting Dome and Triple Enhancement ofTcin the Kagome SuperconductorCsV3Sb5under High Pressure
Physical Review Letters ( IF 8.1 ) Pub Date : 2021-06-17 , DOI: 10.1103/physrevlett.126.247001
K Y Chen _{1,

2} , N N Wang _{1,

2} , Q W Yin ₃ , Y H Gu _{1,

2} , K Jiang _{1,

2} , Z J Tu ₃ , C S Gong ₃ , Y Uwatoko ₄ , J P Sun _{1,

2} , H C Lei ₃ , J P Hu _{1,

2} , J-G Cheng _{1,

2}

Affiliation

{CsV}_{3} {Sb}_{5}

is a newly discovered

Z_{2}

topological kagome metal showing the coexistence of a charge-density-wave (CDW)-like order at

T^{*} = 94 K

and superconductivity (SC) at

T_{c} = 2.5 K

at ambient pressure. Here, we study the interplay between CDW and SC in

{CsV}_{3} {Sb}_{5}

via measurements of resistivity, dc and ac magnetic susceptibility under various pressures up to 6.6 GPa. We find that the CDW transition decreases with pressure and experience a subtle modification at

P_{c 1} \approx 0.6 - 0.9 GPa

before it vanishes completely at

P_{c 2} \approx 2 GPa

. Correspondingly,

T_{c} (P)

displays an unusual

M

-shaped double dome with two maxima around

P_{c 1}

and

P_{c 2}

, respectively, leading to a tripled enhancement of

T_{c}

to about 8 K at 2 GPa. The obtained temperature-pressure phase diagram resembles those of unconventional superconductors, illustrating an intimated competition between CDW-like order and SC. The competition is found to be particularly strong for the intermediate pressure range

P_{c 1} \leq P \leq P_{c 2}

as evidenced by the broad superconducting transition and reduced superconducting volume fraction. The modification of CDW order around

P_{c 1}

has been discussed based on the band structure calculations. This work not only demonstrates the potential to raise

T_{c}

of the V-based kagome superconductors, but also offers more insights into the rich physics related to the electron correlations in this novel family of topological kagome metals.

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