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Title: Electrodynamics of superconducting pnictide superlattices

It was recently shown that superlattices where layers of the 8% Co-doped BaFe{sub 2}As{sub 2} superconducting pnictide are intercalated with non superconducting ultrathin layers of either SrTiO{sub 3} or of oxygen-rich BaFe{sub 2}As{sub 2}, 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.
Authors:
;  [1] ;  [2] ;  [3] ; ; ;  [4] ; ; ;  [5] ;  [6]
  1. INSTM Udr Trieste-ST and Elettra - Sincrotrone Trieste S.C.p.A., Area Science Park, I-34012 Trieste (Italy)
  2. Dipartimento di Fisica, Università di Roma Sapienza, Piazzale Aldo Moro 2, I-00185 Rome (Italy)
  3. CNR-IOM and Dipartimento di Fisica, Università di Roma Sapienza, P.le Aldo Moro 2, I-00185 Roma (Italy)
  4. Department of Materials Science and Engineering, University of Wisconsin-Madison, Madison, Wisconsin 53706 (United States)
  5. Applied Superconductivity Center, National High Magnetic Field Laboratory, Florida State University, 2031 East Paul Dirac Drive, Tallahassee, Florida 32310 (United States)
  6. CNR-SPIN and Dipartimento di Fisica, Università di Roma Sapienza, P.le Aldo Moro 2, I-00185 Roma (Italy)
Publication Date:
OSTI Identifier:
22300105
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 22; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ARSENIC COMPOUNDS; BARIUM COMPOUNDS; CLATHRATES; COBALT ADDITIONS; CRITICAL FIELD; CRITICAL TEMPERATURE; DOPED MATERIALS; ELECTRODYNAMICS; ELECTRONIC STRUCTURE; IRON COMPOUNDS; LAYERS; MAGNETIC FLUX; OXYGEN; PNICTIDES; REFLECTIVITY; STRONTIUM TITANATES; SUPERCONDUCTIVITY; SUPERLATTICES