Critical current densities and flux creep rate in Co-doped BaFe $_{2}$ As $_{2}$ with columnar defects introduced by heavy-Ion irradiation

Nakajima, Yasuyuki*; Tsuchiya, Yuji*; Taen, Toshihiro*; Yagyuda, Hidenori*; Tamegai, Tsuyoshi*; Okayasu, Satoru ; Sasase, Masato*; Kitamura, Hisashi*; Murakami, Takeshi*

We report the formation of columnar defects in Co-doped BaFe $_{2}$ As $_{2}$ single crystals with different heavy ion irradiations. The formation of columnar defects by 200 MeV Au ion irradiation is 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 $_{rm c}$ is enhanced in the 200 MeV Au and 800 MeV Xe ion irradiated samples while $_{rm c}$ is unchanged in the 200 MeV Ni ion irradiated sample. 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.

Language	:	English
Journal	:	Physica C
Volume	:	470
Number	:	20
Pages	:	p.1103 - 1105
Publication Year/Month	:	2010/11
Meeting title	:	22nd International Symposium on Superconductivity (ISS 2009)
Held date	:	2009/11
Location (city)	:	Tsukuba
Location (country)	:	Japan
Patent information	:
PDF	:
Paper URL	:	https://doi.org/10.1016/j.physc.2010.05.047
DOI for research data	:
Keywords	:	no keyword
Research Facility	:	タンデム加速器
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Article of JAEA R&D Review	:
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Registration No. : BB20133467
JAEA Abstracts No. :
Paper Submission No. : 14105

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Critical current densities and flux creep rate in Co-doped BaFeAs with columnar defects introduced by heavy-Ion irradiation

Critical current densities and flux creep rate in Co-doped BaFe $_{2}$ As $_{2}$ with columnar defects introduced by heavy-Ion irradiation