Atomic and electronic structures of superconducting BaFe2As2/SrTiO3 superlattices
P. Gao, Y. Zhang, S. Y. Zhang, S. Lee, J. Weiss, J. R. Jokisaari, E. E. Hellstrom, D. C. Larbalestier, C. B. Eom, X. Q. Pan
DOI 10.1103/PhysRevB.91.104525 · Physical Review B
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Abstract
The nanoscale structural, chemical, and electronic properties of artificial engineered superlattice thin films consisting of superconducting Co-doped BaFe2As2(Ba−122) and nonsuperconducting SrTiO3(STO) layers are determined by using atomically resolved scanning transmission electron microscopy and electron energy loss spectroscopy. The bonding of Ba−122/STO occurring between As (Ba) and SrO(TiO2) terminated layers has been identified. The thin STO (3 unit cell) insertion layers are a mixture of cations (Ba, Sr, Fe, and Ti) and rich in oxygen vacancies and the Ba-122 layers (10 unit cell) are free of vertical second phases. Our results explain why these superlattices show anisotropic transport response to an external magnetic field, i.e., strong ab-axis pinning (enhancing critical current density) and no c-axis pinning, which is opposite to single layer Ba-122 thin films. These findings reveal physical and chemical properties of superconducting/nonsuperconducting heterostructures and provide important insights into engineering of superconducting devices.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| BaFe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 17 | Pressure not reported | onset |
| BaFe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 19.7 | Pressure not reported | zero_resistance |
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