Vortex pinning in artificially layered Ba(Fe,Co)2As2 film

M. J. Oh; Jongmin Lee; Sehun Seo; Sejun Yoon; M. S. Seo; S. Y. Park; Ho Sup Kim; Dong Woo Ha; Sanghan Lee; Youn Jung Jo

doi:10.1016/j.cryogenics.2018.03.006

Vortex pinning in artificially layered Ba(Fe,Co)₂As₂ film

M. J. Oh, Jongmin Lee, Sehun Seo, Sejun Yoon, M. S. Seo, S. Y. Park, Ho Sup Kim, Dong Woo Ha, Sanghan Lee, Youn Jung Jo

Research output: Contribution to journal › Article › peer-review

4 Scopus citations

Abstract

Static high critical current densities (J_c) > 1 MA/cm² with magnetic field parallel or perpendicular to c-axis were realized in Co-doped/undoped multilayerd BaFe₂As₂ films. We made a current bridge by FIB to allow precise measurements, and confirmed that the boundary quality using FIB was considerably better than the quality achieved using a laser. The presence of a high in-plane J_c suggested the existence of c-axis correlated vortex pinning centers. To clarify the relationship between the J_c performance and superstructures, we investigated the magnetic flux pinning mechanism using scaling theory of the volume pinning force F_p(H). The J_c(H) curves, F_p/F_p,max vs. h = H/H_irr curves, and parameters p and q depended on the characteristics of the flux pinning mechanism. It was found that the dominant pinning mechanism of Co-doped/undoped multilayerd BaFe₂As₂ films was Δl-pinning and the inserted undoped BaFe₂As₂ layers remained non-superconducting. The dominant pin geometry varied when the magnetic field direction changed. It was concluded that the artificially layered BaFe₂As₂ film is a 3-D superconductor due to its long correlation length compared to the thickness of the non-superconducting layer.

Original language	English
Pages (from-to)	1-4
Number of pages	4
Journal	Cryogenics
Volume	92
DOIs	https://doi.org/10.1016/j.cryogenics.2018.03.006
State	Published - Jun 2018

Keywords

Artificially layered film
Superconducting film
Vortex pinning scaling

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10.1016/j.cryogenics.2018.03.006

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title = "Vortex pinning in artificially layered Ba(Fe,Co)2As2 film",

abstract = "Static high critical current densities (Jc) > 1 MA/cm2 with magnetic field parallel or perpendicular to c-axis were realized in Co-doped/undoped multilayerd BaFe2As2 films. We made a current bridge by FIB to allow precise measurements, and confirmed that the boundary quality using FIB was considerably better than the quality achieved using a laser. The presence of a high in-plane Jc suggested the existence of c-axis correlated vortex pinning centers. To clarify the relationship between the Jc performance and superstructures, we investigated the magnetic flux pinning mechanism using scaling theory of the volume pinning force Fp(H). The Jc(H) curves, Fp/Fp,max vs. h = H/Hirr curves, and parameters p and q depended on the characteristics of the flux pinning mechanism. It was found that the dominant pinning mechanism of Co-doped/undoped multilayerd BaFe2As2 films was Δl-pinning and the inserted undoped BaFe2As2 layers remained non-superconducting. The dominant pin geometry varied when the magnetic field direction changed. It was concluded that the artificially layered BaFe2As2 film is a 3-D superconductor due to its long correlation length compared to the thickness of the non-superconducting layer.",

keywords = "Artificially layered film, Superconducting film, Vortex pinning scaling",

author = "Oh, {M. J.} and Jongmin Lee and Sehun Seo and Sejun Yoon and Seo, {M. S.} and Park, {S. Y.} and Kim, {Ho Sup} and Ha, {Dong Woo} and Sanghan Lee and Jo, {Youn Jung}",

note = "Publisher Copyright: {\textcopyright} 2018",

year = "2018",

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doi = "10.1016/j.cryogenics.2018.03.006",

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volume = "92",

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T1 - Vortex pinning in artificially layered Ba(Fe,Co)2As2 film

AU - Oh, M. J.

AU - Lee, Jongmin

AU - Seo, Sehun

AU - Yoon, Sejun

AU - Seo, M. S.

AU - Park, S. Y.

AU - Kim, Ho Sup

AU - Ha, Dong Woo

AU - Lee, Sanghan

AU - Jo, Youn Jung

PY - 2018/6

Y1 - 2018/6

N2 - Static high critical current densities (Jc) > 1 MA/cm2 with magnetic field parallel or perpendicular to c-axis were realized in Co-doped/undoped multilayerd BaFe2As2 films. We made a current bridge by FIB to allow precise measurements, and confirmed that the boundary quality using FIB was considerably better than the quality achieved using a laser. The presence of a high in-plane Jc suggested the existence of c-axis correlated vortex pinning centers. To clarify the relationship between the Jc performance and superstructures, we investigated the magnetic flux pinning mechanism using scaling theory of the volume pinning force Fp(H). The Jc(H) curves, Fp/Fp,max vs. h = H/Hirr curves, and parameters p and q depended on the characteristics of the flux pinning mechanism. It was found that the dominant pinning mechanism of Co-doped/undoped multilayerd BaFe2As2 films was Δl-pinning and the inserted undoped BaFe2As2 layers remained non-superconducting. The dominant pin geometry varied when the magnetic field direction changed. It was concluded that the artificially layered BaFe2As2 film is a 3-D superconductor due to its long correlation length compared to the thickness of the non-superconducting layer.

AB - Static high critical current densities (Jc) > 1 MA/cm2 with magnetic field parallel or perpendicular to c-axis were realized in Co-doped/undoped multilayerd BaFe2As2 films. We made a current bridge by FIB to allow precise measurements, and confirmed that the boundary quality using FIB was considerably better than the quality achieved using a laser. The presence of a high in-plane Jc suggested the existence of c-axis correlated vortex pinning centers. To clarify the relationship between the Jc performance and superstructures, we investigated the magnetic flux pinning mechanism using scaling theory of the volume pinning force Fp(H). The Jc(H) curves, Fp/Fp,max vs. h = H/Hirr curves, and parameters p and q depended on the characteristics of the flux pinning mechanism. It was found that the dominant pinning mechanism of Co-doped/undoped multilayerd BaFe2As2 films was Δl-pinning and the inserted undoped BaFe2As2 layers remained non-superconducting. The dominant pin geometry varied when the magnetic field direction changed. It was concluded that the artificially layered BaFe2As2 film is a 3-D superconductor due to its long correlation length compared to the thickness of the non-superconducting layer.

KW - Artificially layered film

KW - Superconducting film

KW - Vortex pinning scaling

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Vortex pinning in artificially layered Ba(Fe,Co)₂As₂ film

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