Critical Thickness in Superconducting LaAlO3/KTaO3(111) Heterostructures
Yanqiu Sun, Yuan Liu, Siyuan Hong, Zheng Chen, Meng Zhang, Yanwu Xie
DOI 10.1103/PhysRevLett.127.086804 · Physical Review Letters
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Abstract
Recently, two-dimensional superconductivity was discovered at the oxide interface between KTaO3 and LaAlO3 (or EuO), whose superconducting transition temperature Tc is up to 2.2 K and exhibits strong crystalline-orientation dependence. However, the origin of the interfacial electron gas, which becomes superconducting at low temperatures, remains elusive. Taking the LaAlO3/KTaO3(111) interface as an example, we have demonstrated that there exists a critical LaAlO3 thickness of ∼3 nm. Namely, a thinner LaAlO3 film will give rise to an insulating but not conducting (or superconducting) interface. By in situ transport measurements during growth, we have also revealed that the critical thickness can be suppressed if exposure to oxygen is avoided. These observations, together with other control experiments, suggest strongly that the origination of the electron gas is dominated by the electron transfer that is from oxygen vacancies in the LaAlO3 film to the KTaO3 substrate.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| LaAlO3/KTaO3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.2 | Pressure not reported | onset |
| LaAlO3/KTaO3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.1 | Pressure not reported | midpoint |
| LaAlO3/KTaO3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.8 | Pressure not reported | midpoint |
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