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.
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2 June 2014
Research Article|
June 03 2014
Electrodynamics of superconducting pnictide superlattices Available to Purchase
A. Perucchi;
A. Perucchi
1
INSTM Udr Trieste-ST and Elettra - Sincrotrone Trieste S.C.p.A.
, Area Science Park, I-34012 Trieste, Italy
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F. Capitani;
F. Capitani
2Dipartimento di Fisica,
Università di Roma Sapienza
, Piazzale Aldo Moro 2, I-00185 Rome, Italy
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P. Di Pietro;
P. Di Pietro
1
INSTM Udr Trieste-ST and Elettra - Sincrotrone Trieste S.C.p.A.
, Area Science Park, I-34012 Trieste, Italy
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S. Lupi;
S. Lupi
3CNR-IOM and Dipartimento di Fisica,
Università di Roma Sapienza
, P.le Aldo Moro 2, I-00185 Roma, Italy
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S. Lee;
S. Lee
4Department of Materials Science and Engineering,
University of Wisconsin-Madison
, Madison, Wisconsin 53706, USA
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J. H. Kang;
J. H. Kang
4Department of Materials Science and Engineering,
University of Wisconsin-Madison
, Madison, Wisconsin 53706, USA
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J. Jiang;
J. Jiang
5Applied Superconductivity Center, National High Magnetic Field Laboratory,
Florida State University
, 2031 East Paul Dirac Drive, Tallahassee, Florida 32310, USA
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J. D. Weiss;
J. D. Weiss
5Applied Superconductivity Center, National High Magnetic Field Laboratory,
Florida State University
, 2031 East Paul Dirac Drive, Tallahassee, Florida 32310, USA
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E. E. Hellstrom;
E. E. Hellstrom
5Applied Superconductivity Center, National High Magnetic Field Laboratory,
Florida State University
, 2031 East Paul Dirac Drive, Tallahassee, Florida 32310, USA
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C. B. Eom;
C. B. Eom
4Department of Materials Science and Engineering,
University of Wisconsin-Madison
, Madison, Wisconsin 53706, USA
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P. Dore
P. Dore
6CNR-SPIN and Dipartimento di Fisica,
Università di Roma Sapienza
, P.le Aldo Moro 2, I-00185 Roma, Italy
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A. Perucchi
1
F. Capitani
2
P. Di Pietro
1
S. Lupi
3
S. Lee
4
J. H. Kang
4
J. Jiang
5
J. D. Weiss
5
E. E. Hellstrom
5
C. B. Eom
4
P. Dore
6
1
INSTM Udr Trieste-ST and Elettra - Sincrotrone Trieste S.C.p.A.
, Area Science Park, I-34012 Trieste, Italy
2Dipartimento di Fisica,
Università di Roma Sapienza
, Piazzale Aldo Moro 2, I-00185 Rome, Italy
3CNR-IOM and Dipartimento di Fisica,
Università di Roma Sapienza
, P.le Aldo Moro 2, I-00185 Roma, Italy
4Department of Materials Science and Engineering,
University of Wisconsin-Madison
, Madison, Wisconsin 53706, USA
5Applied Superconductivity Center, National High Magnetic Field Laboratory,
Florida State University
, 2031 East Paul Dirac Drive, Tallahassee, Florida 32310, USA
6CNR-SPIN and Dipartimento di Fisica,
Università di Roma Sapienza
, P.le Aldo Moro 2, I-00185 Roma, Italy
Appl. Phys. Lett. 104, 222601 (2014)
Article history
Received:
April 02 2014
Accepted:
May 20 2014
Citation
A. Perucchi, F. Capitani, P. Di Pietro, S. Lupi, S. Lee, J. H. Kang, J. Jiang, J. D. Weiss, E. E. Hellstrom, C. B. Eom, P. Dore; Electrodynamics of superconducting pnictide superlattices. Appl. Phys. Lett. 2 June 2014; 104 (22): 222601. https://doi.org/10.1063/1.4880939
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