Pressure-induced double superconducting domes and charge instability in the kagome metal KV3Sb5

Feng Du; Shuaishuai Luo; Brenden R. Ortiz; Ye Chen; Weiyin Duan; Dongting Zhang; Xin Lu; Stephen D. Wilson; Yu Song; Huiqiu Yuan

doi:10.1103/PhysRevB.103.L220504

Pressure-induced double superconducting domes and charge instability in the kagome metal KV3Sb5

Feng Du, Shuaishuai Luo, Brenden R. Ortiz, Ye Chen, Weiyin Duan, Dongting Zhang, Xin Lu, Stephen D. Wilson, Yu Song, Huiqiu Yuan

Research output: Contribution to journal › Article › peer-review

129 Scopus citations

Abstract

The kagome metal KV3Sb5 hosts charge order, topologically nontrivial Dirac band crossings, and a superconducting ground state with unconventional characteristics, providing an ideal platform to investigate the interplay between different electronic states on the kagome lattice. Here we study the evolution of charge order and superconductivity in KV3Sb5 under hydrostatic pressure using electrical resistivity measurements. With the application of pressure, the superconducting transition temperature Tc=0.9 K under ambient pressure quickly increases to 3.1 K at p=0.4 GPa, as charge order progressively weakens. Upon further increasing pressure, signatures of charge order disappear at pc1≈0.5 GPa and Tc is gradually suppressed, forming a superconducting dome that terminates at p≈10 GPa. Beyond p≈10 GPa, a second superconducting dome emerges with maximum Tc≈1.0 K at pc2≈22 GPa, which becomes fully suppressed at p≈28 GPa. The suppression of superconductivity for the second superconducting dome is associated with the appearance of a unique high-pressure phase, possibly a distinct charge order.

Original language	English
Article number	L220504
Journal	Physical Review B
Volume	103
Issue number	22
DOIs	https://doi.org/10.1103/PhysRevB.103.L220504
State	Published - Jun 1 2021
Externally published	Yes

Funding

This work was supported by the National Key R&D Program of China (Grants No. 2017YFA0303100 and No. 2016YFA0300202), the Key R&D Program of Zhejiang Province, China (Grant No. 2021C01002), the National Natural Science Foundation of China (Grants No. 11974306 and No. 12034017), the Science Challenge Project of China (Grant No. TZ2016004), and the Fundamental Research Funds for the Central Universities of China. S.D.W. and B.R.O. gratefully acknowledge support via the UC Santa Barbara NSF Quantum Foundry funded via the Q-AMASE-i program under Award No. DMR-1906325. B.R.O. also acknowledges support from the California NanoSystems Institute through the Elings fellowship program.

Funders	Funder number
California NanoSystems Institute
Key R&D Program of Zhejiang Province	2021C01002
Science Challenge Project of China	TZ2016004
UC Santa Barbara NSF	DMR-1906325
National Natural Science Foundation of China	12034017, 11974306
National Key Research and Development Program of China	2017YFA0303100, 2016YFA0300202
Fundamental Research Funds for the Central Universities

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title = "Pressure-induced double superconducting domes and charge instability in the kagome metal KV3Sb5",

abstract = "The kagome metal KV3Sb5 hosts charge order, topologically nontrivial Dirac band crossings, and a superconducting ground state with unconventional characteristics, providing an ideal platform to investigate the interplay between different electronic states on the kagome lattice. Here we study the evolution of charge order and superconductivity in KV3Sb5 under hydrostatic pressure using electrical resistivity measurements. With the application of pressure, the superconducting transition temperature Tc=0.9 K under ambient pressure quickly increases to 3.1 K at p=0.4 GPa, as charge order progressively weakens. Upon further increasing pressure, signatures of charge order disappear at pc1≈0.5 GPa and Tc is gradually suppressed, forming a superconducting dome that terminates at p≈10 GPa. Beyond p≈10 GPa, a second superconducting dome emerges with maximum Tc≈1.0 K at pc2≈22 GPa, which becomes fully suppressed at p≈28 GPa. The suppression of superconductivity for the second superconducting dome is associated with the appearance of a unique high-pressure phase, possibly a distinct charge order.",

author = "Feng Du and Shuaishuai Luo and Ortiz, {Brenden R.} and Ye Chen and Weiyin Duan and Dongting Zhang and Xin Lu and Wilson, {Stephen D.} and Yu Song and Huiqiu Yuan",

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AU - Chen, Ye

AU - Duan, Weiyin

AU - Zhang, Dongting

AU - Lu, Xin

AU - Wilson, Stephen D.

AU - Song, Yu

AU - Yuan, Huiqiu

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N2 - The kagome metal KV3Sb5 hosts charge order, topologically nontrivial Dirac band crossings, and a superconducting ground state with unconventional characteristics, providing an ideal platform to investigate the interplay between different electronic states on the kagome lattice. Here we study the evolution of charge order and superconductivity in KV3Sb5 under hydrostatic pressure using electrical resistivity measurements. With the application of pressure, the superconducting transition temperature Tc=0.9 K under ambient pressure quickly increases to 3.1 K at p=0.4 GPa, as charge order progressively weakens. Upon further increasing pressure, signatures of charge order disappear at pc1≈0.5 GPa and Tc is gradually suppressed, forming a superconducting dome that terminates at p≈10 GPa. Beyond p≈10 GPa, a second superconducting dome emerges with maximum Tc≈1.0 K at pc2≈22 GPa, which becomes fully suppressed at p≈28 GPa. The suppression of superconductivity for the second superconducting dome is associated with the appearance of a unique high-pressure phase, possibly a distinct charge order.

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Pressure-induced double superconducting domes and charge instability in the kagome metal KV3Sb5

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