Superconducting phase of TixOy thin films grown by molecular beam epitaxy
Yasemin Ozbek, Cooper Brooks, Xuanyi Zhang, Athby Al-Tawhid, Vladmir A. Stoica, Zhan Zhang, Divine P. Kumah
DOI 10.1103/PhysRevMaterials.6.064805 · Physical Review Materials
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Abstract
We investigate the complex relationship between the growth conditions and the structural and transport properties of TixOy thin films grown by molecular beam epitaxy. Transport properties ranging from metallicity to superconductivity and insulating states are stabilized by effectively tuning the O/Ti ratio via the Ti flux rate and the O partial pressure POx for films grown on (0001)−Al2O3 substrates at 850∘ C. A cubic c−TiO1±δ buffer layer is formed for low O/Ti ratios, while a corundum cr−Ti2O3 layer is formed under higher-oxidizing conditions. Metallicity is observed for c−TiO1−δ buffer layers. The superconducting γ−Ti3O5 Magnéli phase is found to nucleate on a c−TiO1−δ buffer for intermediate POx conditions, and an insulator-superconducting transition is observed at 4.5 K (TConset=6K) for 85 nm thick films. Strain relaxation of γ−Ti3O5 occurs with increasing film thickness and correlates with a thickness-dependent increase in TC observed for TixOy thin films.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Ti3O5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 6 | Pressure not reported | onset |
| Ti3O5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4.5 | Pressure not reported | zero_resistance |
| Ti3O5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3.7 | Pressure not reported | onset |
| TiO Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2 | Pressure not reported | unknown |
| Ti2O3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 8 | Pressure not reported | unknown |
| TiO1+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 7.4 | Pressure not reported | unknown |
| Ti4O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3 | Pressure not reported | unknown |
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