Extreme magnetic anisotropy and multiple superconducting transition signatures in a [Nb(23 nm)/Ni(5 nm)]5 multilayer

L. E. De Long; S. A. Kryukov; Amish G. Joshi; Wentao Xu; A. Bosomtwi; B. J. Kirby; M. R. Fitzsimmons

doi:10.1016/j.physc.2007.11.073

Extreme magnetic anisotropy and multiple superconducting transition signatures in a [Nb(23 nm)/Ni(5 nm)]₅ multilayer

L. E. De Long
, S. A. Kryukov
, Amish G. Joshi
, Wentao Xu
, A. Bosomtwi
, B. J. Kirby
, M. R. Fitzsimmons

Physics And Astronomy

Producción científica: Article › revisión exhaustiva

4 Citas (Scopus)

Resumen

We have applied polarized neutron reflectometry, and novel SQUID and vibrating reed magnetometry to probe a [Nb(23 nm)/Ni(5 nm)]₅ multilayer (ML) whose superconducting state magnetic anisotropy is dominated by confined (in-plane) supercurrents in DC magnetic fields, H, applied nearly parallel to the ML plane. The upper critical field exhibits abrupt shifts (0.1-0.6 K) in near-parallel fields, but is field-independent for μ₀H < 0.8 T when the ML is exactly aligned with the DC field, indicating suppression of orbital pairbreaking and the possible presence of unconventional superconducting pairing states.

Idioma original	English
Páginas (desde-hasta)	523-530
Número de páginas	8
Publicación	Physica C: Superconductivity and its Applications
Volumen	468
N.º	7-10
DOI	https://doi.org/10.1016/j.physc.2007.11.073
Estado	Published - abr 1 2008

Nota bibliográfica

Funding Information:
Research at the University of Kentucky was supported by U.S. DoE Grant #DE-FG02-97ER45653 and Kentucky Science and Engineering Foundation Grant #KSEF-148-502-03-49. A.G.J. was supported as a BOYSCAST Fellow of Indian Ministry of Science and Technology, Grant No. SR/BY/P-01/04. Prof. Jose L. Vicent of the Universidad Complutense, Madrid, contributed Nb/Ni ML for this work.

Financiación

Research at the University of Kentucky was supported by U.S. DoE Grant #DE-FG02-97ER45653 and Kentucky Science and Engineering Foundation Grant #KSEF-148-502-03-49. A.G.J. was supported as a BOYSCAST Fellow of Indian Ministry of Science and Technology, Grant No. SR/BY/P-01/04. Prof. Jose L. Vicent of the Universidad Complutense, Madrid, contributed Nb/Ni ML for this work.

Financiadores	Número del financiador
Michigan State University-U.S. Department of Energy (MSU-DOE) Plant Research Laboratory	FG02-97ER45653
Kentucky Science and Engineering Foundation	-148-502-03-49

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Energy Engineering and Power Technology
Electrical and Electronic Engineering

Acceder al documento

10.1016/j.physc.2007.11.073

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title = "Extreme magnetic anisotropy and multiple superconducting transition signatures in a [Nb(23 nm)/Ni(5 nm)]5 multilayer",

abstract = "We have applied polarized neutron reflectometry, and novel SQUID and vibrating reed magnetometry to probe a [Nb(23 nm)/Ni(5 nm)]5 multilayer (ML) whose superconducting state magnetic anisotropy is dominated by confined (in-plane) supercurrents in DC magnetic fields, H, applied nearly parallel to the ML plane. The upper critical field exhibits abrupt shifts (0.1-0.6 K) in near-parallel fields, but is field-independent for μ0H < 0.8 T when the ML is exactly aligned with the DC field, indicating suppression of orbital pairbreaking and the possible presence of unconventional superconducting pairing states.",

keywords = "Magnetic multilayers, Mesoscopic superconductors, Neutron reflectometry, Superconducting critical field, Superconducting multilayers, Superconducting phase diagrams",

author = "\{De Long\}, \{L. E.\} and Kryukov, \{S. A.\} and Joshi, \{Amish G.\} and Wentao Xu and A. Bosomtwi and Kirby, \{B. J.\} and Fitzsimmons, \{M. R.\}",

note = "Funding Information: Research at the University of Kentucky was supported by U.S. DoE Grant \#DE-FG02-97ER45653 and Kentucky Science and Engineering Foundation Grant \#KSEF-148-502-03-49. A.G.J. was supported as a BOYSCAST Fellow of Indian Ministry of Science and Technology, Grant No. SR/BY/P-01/04. Prof. Jose L. Vicent of the Universidad Complutense, Madrid, contributed Nb/Ni ML for this work. ",

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AU - De Long, L. E.

AU - Kryukov, S. A.

AU - Joshi, Amish G.

AU - Xu, Wentao

AU - Bosomtwi, A.

AU - Kirby, B. J.

AU - Fitzsimmons, M. R.

N1 - Funding Information: Research at the University of Kentucky was supported by U.S. DoE Grant #DE-FG02-97ER45653 and Kentucky Science and Engineering Foundation Grant #KSEF-148-502-03-49. A.G.J. was supported as a BOYSCAST Fellow of Indian Ministry of Science and Technology, Grant No. SR/BY/P-01/04. Prof. Jose L. Vicent of the Universidad Complutense, Madrid, contributed Nb/Ni ML for this work.

PY - 2008/4/1

Y1 - 2008/4/1

N2 - We have applied polarized neutron reflectometry, and novel SQUID and vibrating reed magnetometry to probe a [Nb(23 nm)/Ni(5 nm)]5 multilayer (ML) whose superconducting state magnetic anisotropy is dominated by confined (in-plane) supercurrents in DC magnetic fields, H, applied nearly parallel to the ML plane. The upper critical field exhibits abrupt shifts (0.1-0.6 K) in near-parallel fields, but is field-independent for μ0H < 0.8 T when the ML is exactly aligned with the DC field, indicating suppression of orbital pairbreaking and the possible presence of unconventional superconducting pairing states.

AB - We have applied polarized neutron reflectometry, and novel SQUID and vibrating reed magnetometry to probe a [Nb(23 nm)/Ni(5 nm)]5 multilayer (ML) whose superconducting state magnetic anisotropy is dominated by confined (in-plane) supercurrents in DC magnetic fields, H, applied nearly parallel to the ML plane. The upper critical field exhibits abrupt shifts (0.1-0.6 K) in near-parallel fields, but is field-independent for μ0H < 0.8 T when the ML is exactly aligned with the DC field, indicating suppression of orbital pairbreaking and the possible presence of unconventional superconducting pairing states.

KW - Magnetic multilayers

KW - Mesoscopic superconductors

KW - Neutron reflectometry

KW - Superconducting critical field

KW - Superconducting multilayers

KW - Superconducting phase diagrams

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