Self-assembled oxide nanopillars in epitaxial BaFe2As 2 thin films for vortex pinning

Yi Zhang; Christopher T. Nelson; Sanghan Lee; Jianyi Jiang; Chung Wung Bark; Jeremy D. Weiss; Chiara Tarantini; Chad M. Folkman; Seung Hyub Baek; Eric E. Hellstrom; David C. Larbalestier; Chang Beom Eom; Xiaoqing Pan

doi:10.1063/1.3532107

Self-assembled oxide nanopillars in epitaxial BaFe₂As ₂ thin films for vortex pinning

Yi Zhang, Christopher T. Nelson, Sanghan Lee, Jianyi Jiang, Chung Wung Bark, Jeremy D. Weiss, Chiara Tarantini, Chad M. Folkman, Seung Hyub Baek, Eric E. Hellstrom, David C. Larbalestier, Chang Beom Eom, Xiaoqing Pan

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

42 Scopus citations

Abstract

We report the structure and chemistry of the self-assembled oxide nanopillars that form in superconducting Co-doped BaFe₂As₂ thin film grown by pulsed laser deposition. The oxide nanopillars consist of a BaFeO₂ phase, form epitaxially on the SrTiO₃ template, and grow coherently with the BaFe₂As₂ film. The nanopillars are square with a uniform size of 4-5 nm, which is close to twice the superconducting coherence length. Despite a volume content of ∼5%, the nanopillars do not degrade the structural quality of the BaFe₂As ₂ matrix. Indeed the nanopillars provide exceptionally strong vortex pinning and high critical current density due to the very close correlation of pillar and vortex core diameters.

Original language	English
Article number	042509
Journal	Applied Physics Letters
Volume	98
Issue number	4
DOIs	https://doi.org/10.1063/1.3532107
State	Published - Jan 24 2011
Externally published	Yes

Funding

This work was supported by the Department of Energy under Grant Nos. DE-FG02-07ER46416 and DE-FG02-06ER46327, NSF under Award Nos. DMR-0907191, DMR-0723032, DMR-0820404, and DMR-0084173, and AFOSR under Grant No. FA9550-06-1-0474.

Funders	Funder number
National Science Foundation	DMR-0907191, DMR-0084173, DMR-0723032, DMR-0820404
U.S. Department of Energy	DE-FG02-06ER46327, DE-FG02-07ER46416
Air Force Office of Scientific Research	FA9550-06-1-0474

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title = "Self-assembled oxide nanopillars in epitaxial BaFe2As 2 thin films for vortex pinning",

abstract = "We report the structure and chemistry of the self-assembled oxide nanopillars that form in superconducting Co-doped BaFe2As2 thin film grown by pulsed laser deposition. The oxide nanopillars consist of a BaFeO2 phase, form epitaxially on the SrTiO3 template, and grow coherently with the BaFe2As2 film. The nanopillars are square with a uniform size of 4-5 nm, which is close to twice the superconducting coherence length. Despite a volume content of ∼5%, the nanopillars do not degrade the structural quality of the BaFe2As 2 matrix. Indeed the nanopillars provide exceptionally strong vortex pinning and high critical current density due to the very close correlation of pillar and vortex core diameters.",

author = "Yi Zhang and Nelson, {Christopher T.} and Sanghan Lee and Jianyi Jiang and Bark, {Chung Wung} and Weiss, {Jeremy D.} and Chiara Tarantini and Folkman, {Chad M.} and Baek, {Seung Hyub} and Hellstrom, {Eric E.} and Larbalestier, {David C.} and Eom, {Chang Beom} and Xiaoqing Pan",

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T1 - Self-assembled oxide nanopillars in epitaxial BaFe2As 2 thin films for vortex pinning

AU - Zhang, Yi

AU - Nelson, Christopher T.

AU - Lee, Sanghan

AU - Jiang, Jianyi

AU - Bark, Chung Wung

AU - Weiss, Jeremy D.

AU - Tarantini, Chiara

AU - Folkman, Chad M.

AU - Baek, Seung Hyub

AU - Hellstrom, Eric E.

AU - Larbalestier, David C.

AU - Eom, Chang Beom

AU - Pan, Xiaoqing

PY - 2011/1/24

Y1 - 2011/1/24

N2 - We report the structure and chemistry of the self-assembled oxide nanopillars that form in superconducting Co-doped BaFe2As2 thin film grown by pulsed laser deposition. The oxide nanopillars consist of a BaFeO2 phase, form epitaxially on the SrTiO3 template, and grow coherently with the BaFe2As2 film. The nanopillars are square with a uniform size of 4-5 nm, which is close to twice the superconducting coherence length. Despite a volume content of ∼5%, the nanopillars do not degrade the structural quality of the BaFe2As 2 matrix. Indeed the nanopillars provide exceptionally strong vortex pinning and high critical current density due to the very close correlation of pillar and vortex core diameters.

AB - We report the structure and chemistry of the self-assembled oxide nanopillars that form in superconducting Co-doped BaFe2As2 thin film grown by pulsed laser deposition. The oxide nanopillars consist of a BaFeO2 phase, form epitaxially on the SrTiO3 template, and grow coherently with the BaFe2As2 film. The nanopillars are square with a uniform size of 4-5 nm, which is close to twice the superconducting coherence length. Despite a volume content of ∼5%, the nanopillars do not degrade the structural quality of the BaFe2As 2 matrix. Indeed the nanopillars provide exceptionally strong vortex pinning and high critical current density due to the very close correlation of pillar and vortex core diameters.

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Self-assembled oxide nanopillars in epitaxial BaFe₂As ₂ thin films for vortex pinning

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