Tuning charge density wave order and superconductivity in the kagome metals KV3Sb5−xSnx and RbV3Sb5−xSnx
Yuzki M. Oey, Farnaz Kaboudvand, Brenden R. Ortiz, Ram Seshadri, Stephen D. Wilson
DOI 10.1103/PhysRevMaterials.6.074802 · Physical Review Materials
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Abstract
The family of AV3Sb5 (A = K, Rb, Cs) kagome metals exhibits charge density wave (CDW) order, proposed to be chiral, followed by a lower temperature superconducting state. Recent studies have proposed the importance of band structure saddle points proximal to the Fermi energy in governing these two transitions. Here we show the effects of hole doping achieved via chemical substitution of Sn for Sb on the CDW and superconducting states in both KV3Sb5 and RbV3Sb5 and generate a phase diagram. Hole doping lifts the Γ pocket and van Hove singularities toward EF causing the superconducting TC in both systems to increase to about 4.5 K, while rapidly suppressing the CDW state.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| KV3Sb5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.93 | Pressure not reported | unknown |
| RbV3Sb5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.92 | Pressure not reported | unknown |
| KV3Sb5-xSnx Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4.37 | Pressure not reported | onset |
| RbV3Sb5-xSnx Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4.5 | Pressure not reported | onset |
| KV3Sb4.80Sn0.20 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4.25 | Pressure not reported | zero_resistance |
| RbV3Sb4.60Sn0.40 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4.4 | Pressure not reported | zero_resistance |
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