Enhancement of critical current density in Co-doped ${\text{BaFe}}_{2}{\text{As}}_{2}$ with columnar defects introduced by heavy-ion irradiation

Enhancement of critical current density in Co-doped ${BaFe}_{2} {As}_{2}$ with columnar defects introduced by heavy-ion irradiation

Y. Nakajima, Y. Tsuchiya, T. Taen, T. Tamegai, S. Okayasu, and M. Sasase

Phys. Rev. B 80, 012510 – Published 30 July 2009

Abstract

We report the realization of columnar defects in Co-doped ${BaFe}_{2} {As}_{2}$ single crystal by heavy-ion irradiation. The columnar defects are confirmed by transmission electron microscopy, and their density is about 40% of the irradiation dose. Magneto-optical imaging and bulk magnetization measurements reveal that the critical current density is strongly enhanced in the irradiated region. We also find that vortex creep rates are strongly suppressed by the columnar defects. We compare the effect of heavy-ion irradiation into Co-doped ${BaFe}_{2} {As}_{2}$ and cuprate superconductors.

Received 26 June 2009

DOI:https://doi.org/10.1103/PhysRevB.80.012510

Authors & Affiliations

Y. Nakajima^1,2, Y. Tsuchiya¹, T. Taen¹, T. Tamegai^1,2, S. Okayasu³, and M. Sasase⁴

¹Department of Applied Physics, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
²JST, Transformative Research-Project on Iron Pnictides (TRIP), 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
³Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
⁴The Wakasa-wan Energy Research Center, Research and Development Group, 64-52-1 Nagatani, Tsuruga, Fukui 914-0192, Japan

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Vol. 80, Iss. 1 — 1 July 2009

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Physical Review B

covering condensed matter and materials physics

Enhancement of critical current density in Co-doped ${BaFe}_{2} {As}_{2}$ with columnar defects introduced by heavy-ion irradiation

Y. Nakajima, Y. Tsuchiya, T. Taen, T. Tamegai, S. Okayasu, and M. Sasase

Phys. Rev. B 80, 012510 – Published 30 July 2009

Abstract

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Physical Review B

covering condensed matter and materials physics

Enhancement of critical current density in Co-doped BaFe2As2 with columnar defects introduced by heavy-ion irradiation

Y. Nakajima, Y. Tsuchiya, T. Taen, T. Tamegai, S. Okayasu, and M. Sasase

Phys. Rev. B 80, 012510 – Published 30 July 2009

Abstract

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Enhancement of critical current density in Co-doped ${BaFe}_{2} {As}_{2}$ with columnar defects introduced by heavy-ion irradiation