Magnetic Exchange Fields and Domain Wall Superconductivity at an All-Oxide Superconductor-Ferromagnet Insulator Interface
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Publication Date
2018-08-17Journal Title
Physical Review Letters
ISSN
0031-9007
Publisher
American Physical Society
Volume
121
Issue
2018
Number
077003
Pages
1-7
Language
English
Type
Article
This Version
VoR
Metadata
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Komori, S., Di Bernardo, A., Buzdin, A., Blamire, M., & Robinson, J. (2018). Magnetic Exchange Fields and Domain Wall Superconductivity at an All-Oxide Superconductor-Ferromagnet Insulator Interface. Physical Review Letters, 121 (2018. 077003), 1-7. https://doi.org/10.1103/PhysRevLett.121.077003
Abstract
At a superconductor-ferromagnet (S=F) interface, the F layer can introduce a magnetic exchange field
within the S layer, which acts to locally spin split the superconducting density of states. The effect of
magnetic exchange fields on superconductivity has been thoroughly explored at S-ferromagnet insulator
(S=FI) interfaces for isotropic s-wave S and a thickness that is smaller than the superconducting coherence
length. Here we report a magnetic exchange field effect at an all-oxide S=FI interface involving the
anisotropic d-wave high temperature superconductor praseodymium cerium copper oxide (PCCO) and the
FI praseodymium calcium manganese oxide (PCMO). The magnetic exchange field in PCCO, detected via
magnetotransport measurements through the superconducting transition, is localized to the PCCO=PCMO
interface with an average magnitude that depends on the presence or absence of magnetic domain walls in
PCMO. The results are promising for the development of all-oxide superconducting spintronic devices
involving unconventional pairing and high temperature superconductors.
Keywords
proximity effect, superconductor, ferromagnet
Relationships
Is supplemented by: https://doi.org/10.17863/CAM.25153
Sponsorship
S. K., M. G. B., A. D. B., and J. W. A. R. acknowledge
funding from the EPSRC through International Network
and Programme Grants (No. EP/P026311/1 and No. EP/
N017242/1). J. W. A. R. acknowledges funding from the
Royal Society through a University Research Fellowship
and with M. G. B. and A. I. B., funding from the
Leverhulme Trust and EU Network COST CA16218
(NANOCOHYBRI). A. D. B. acknowledges funding from
St. John’s College, Cambridge. S. K. was supported by
Grant-in-Aid for JSPS Research Fellows (No. 15J07623).
Funder references
Engineering and Physical Sciences Research Council (EP/P026311/1)
Engineering and Physical Sciences Research Council (EP/N017242/1)
Engineering and Physical Sciences Research Council (EP/P024947/1)
Engineering and Physical Sciences Research Council (EP/S019367/1)
Engineering and Physical Sciences Research Council (EP/R00661X/1)
Identifiers
External DOI: https://doi.org/10.1103/PhysRevLett.121.077003
This record's URL: https://www.repository.cam.ac.uk/handle/1810/296494
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