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Tamegai, Tsuyoshi*; Taen, Toshihiro*; Tsuchiya, Yuji*; Nakajima, Yasuyuki*; Okayasu, Satoru; Sasase, Masato*
Journal of Superconductivity and Novel Magnetism, 23(5), p.605 - 608, 2010/07
Times Cited Count:0 Percentile:0(Physics, Applied)Superconducting properties are evaluated for high-quality single crystals of Ba(FeCo)As in a wide range of doping levels. The critical current density, , in an optimally-doped crystal (Tc 24 K) shows a fishtail effect with its value over 10 A/cm even at 5 T below 10 K. Magneto-optical imaging has clarified rather homogeneous supercurrent flow in the crystal, in spite of a large amount of impurities. In the heavy-ion irradiated sample, the presence of columnar defects are confirmed and has been enhanced by a factor of five at low temperatures, reaching 6 10 A/cm at 2 K under zero field. Flux creep rate in the heavy-ion irradiated sample has been reduced in accordance with the enhancement of .
Machida, Masahiko; Okumura, Masahiko; Yamada, Susumu; Ohashi, Yoji*; Matsumoto, Hideki*
Journal of Superconductivity and Novel Magnetism, 22(3), p.275 - 279, 2009/04
Times Cited Count:1 Percentile:6.07(Physics, Applied)no abstracts in English