Electrodynamics of superconducting pnictide superlattices

It was recently shown that superlattices where layers of the 8% Co-doped BaFe2As2 superconducting pnictide are intercalated with non superconducting ultrathin layers of either SrTiO3 or of oxygen-rich BaFe2As2, can be used to control flux pinning, thereby increasing critical fields and currents, wit...

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Bibliographic Details
Published in:Applied physics letters 2014-06, Vol.104 (22)
Main Authors: Perucchi, A., Capitani, F., Pietro, P. Di, Lupi, S., Lee, S., Kang, J. H., Jiang, J., Weiss, J. D., Hellstrom, E. E., Eom, C. B., Dore, P.
Format: Article
Language:English
Subjects:
Applied physics
ARSENIC COMPOUNDS
BARIUM COMPOUNDS
CLATHRATES
COBALT ADDITIONS
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
CRITICAL FIELD
CRITICAL TEMPERATURE
DOPED MATERIALS
ELECTRODYNAMICS
ELECTRONIC STRUCTURE
Flux pinning
Group 5A compounds
IRON COMPOUNDS
LAYERS
MAGNETIC FLUX
OXYGEN
PNICTIDES
Quantum theory
REFLECTIVITY
STRONTIUM TITANATES
SUPERCONDUCTIVITY
SUPERLATTICES
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Summary:It was recently shown that superlattices where layers of the 8% Co-doped BaFe2As2 superconducting pnictide are intercalated with non superconducting ultrathin layers of either SrTiO3 or of oxygen-rich BaFe2As2, can be used to control flux pinning, thereby increasing critical fields and currents, without significantly affecting the critical temperature of the pristine superconducting material. However, little is known about the electron properties of these systems. Here, we investigate the electrodynamics of these superconducting pnictide superlattices in the normal and superconducting state by using infrared reflectivity, from THz to visible range. We find that multigap structure of these superlattices is preserved, whereas some significant changes are observed in their electronic structure with respect to those of the original pnictide. Our results suggest that possible attempts to further increase the flux pinning may lead to a breakdown of the pnictide superconducting properties.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4880939