Tc up to 23.6 K and robust superconductivity in the transition metal δ−Ti phase at megabar pressure
Xuqiang Liu, Peng Jiang, Yiming Wang, Mingtao Li, Nana Li, Qian Zhang, Yandong Wang, Yan-Ling Li, Wenge Yang
DOI 10.1103/PhysRevB.105.224511 · Physical Review B
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Abstract
We report a high superconducting transition temperature Tc up to 23.6 K, renewing the highest value in transition metals, under high pressure in the elemental metal Ti, one of the top ten most abundant elements in the earth's crust. The Tc increases monotonically from 2.3 K at 40.3 GPa to 23.6 K at 144.9 GPa. With further compression, a robust Tc of ∼23 K is observed between 144.9 and 183 GPa in the δ-Ti phase. The pressure-dependent Tc can be well described by the conventional electron-phonon coupling (EPC) mechanism. Density functional theory calculations show the Fermi nesting and the phonon softening of optical branches at the γ-Ti to δ-Ti phase transition pressure-enhanced EPC, which results in the high Tc. We attribute the robust superconductivity in δ−Ti to the apparent robustness of its strong EPC against lattice compression. These results provide insight into exploring high-Tc elemental metals and Ti-based superconducting alloys.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Ti Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.3 | 40.3 GPa | onset |
| Ti Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 23.6 | 144.9 GPa | onset |
| Ti Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 23 | 183 GPa | onset |
| Ti Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 23 | 140 GPa | unknown |
| Ca Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 21 | 216 GPa | unknown |
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