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Coherent interfacial bonding on the FeAs tetrahedron in Fe/Ba(Fe(1-x)Co(x))2As2 bilayers

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arxiv 1004.5557 v1 pith:5UCTP3LV submitted 2010-04-30 cond-mat.supr-con cond-mat.mtrl-sci

Coherent interfacial bonding on the FeAs tetrahedron in Fe/Ba(Fe(1-x)Co(x))2As2 bilayers

Thomas Thersleff , Kazumasa Iida , Silvia Haindl , Martin Kidszun , Darius Pohl , Andreas Hartmann , Fritz Kurth , Jens Haenisch
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Ruben Huehne Bernd Rellinghaus Ludwig Schultz Bernhard Holzapfel
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classification cond-mat.supr-con cond-mat.mtrl-sci
keywords ba-122bilayersfeasinterfacialbondingcoherentcrystaliron
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We demonstrate the growth of epitaxial Fe/Ba(Fe(1-x)Co(x))2As2 (Fe/Ba-122) bilayers on MgO(001) and LSAT(001) single crystal substrates using Pulsed Laser Deposition (PLD). By exploiting the metallic nature of the FeAs tetrahedron in the Ba-122 crystal structure, we achieve a coherent interfacial bond between bcc iron and Co-doped Ba-122. Tc values for both bilayers were 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 the fabrication of superconducting/ferromagnetic heterostructures.

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