Coherent interfacial bonding on the FeAs tetrahedron in Fe/Ba(Fe1-xCox)2As2 bilayers

Thersleff, T.; Iida, K.; Haindl, S.; Kidszun, M.; Pohl, D.; Hartmann, A.; Kurth, F.; Hänisch, J.; Hühne, R.; Rellinghaus, B.; Schultz, L.; Holzapfel, B.
July 2010
Applied Physics Letters;7/12/2010, Vol. 97 Issue 2, p022506
Academic Journal
We demonstrate the growth of epitaxial Fe/Ba(Fe1-xCox)2As2 bilayers on MgO(001) and (La,Sr)(Al,Ta)O3(001) single crystal substrates using pulsed laser deposition (PLD). This architecture produces a coherent interfacial bond between body-centered cubic iron and Ba(Fe1-xCox)2As2 (Ba–122). The superconducting transition temperatures for both bilayers remain close to that of the PLD target. Direct observation of interfacial bonding between Fe and the Ba–122 FeAs sublattice by atomic resolution transmission electron microscopy implies that this bilayer architecture may work for other iron pnictide systems and pave the way for their fabrication into superconducting/ferromagnetic heterostructures.


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