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IrSi
Pyon, S.*; Kudo, Kazutaka*; Matsumura, Junichi*; Ishii, Hiroyuki*; Matsuo, Genta*; Nohara, Minoru*; Hojo, Hajime*; Oka, Kengo*; Azuma, Masaki*; Garlea, V. O.*; et al.
Journal of the Physical Society of Japan, 83(9), p.093706_1 - 093706_5, 2014/09
Times Cited Count：35 Percentile：81.62(Physics, Multidisciplinary)Pyon, S.*; Tsuchiya, Yuji*; Inoue, Hiroshi*; Koizumi, Norikiyo; Kajitani, Hideki; Tamegai, Tsuyoshi*
Physica C, 504, p.69 - 72, 2014/09
Times Cited Count：6 Percentile：25.91(Physics, Applied)no abstracts in English
As PIT wiresPyon, S.*; Tsuchiya, Yuji*; Inoue, Hiroshi*; Kajitani, Hideki; Koizumi, Norikiyo; Awaji, Satoshi*; Watanabe, Kazuo*; Tamegai, Tsuyoshi*
Superconductor Science and Technology, 27(9), p.095002_1 - 095002_7, 2014/09
Many scientists have been trying to improve the superconductor performance of ferrous strand "((Sr,K)FeAs" with improvement of the dope materials and fabricating process. Especially, it is expected that heat treatment under high pressure for the strand is good for improvement of the critical current performance because it makes intercrystalline bond power in the material stronger. In past study, using some kinds of tape strand, the improvement of critical current performance could be experimentally achieved with this method. In this paper, it is shown that the author newly fabricated rounded strand and HIP (700 degrees, 4 hours, 120 MPa) was applied for it and then the critical performance was measured. The result could be achieved as 1[kA/mm
]. This high value is meaningful in terms of the application for the magnet and some apparatuses.
c characteristics in PIT wires based on BaFeAs with different substitutionsTamegai, Tsuyoshi*; Pyon, S.*; Ding, Q. P.*; Inoue, Hiroshi*; Kobayashi, Hiroki*; Tsuchiya, Yuji*; Sun, Y.*; Kajitani, Hideki; Koizumi, Norikiyo
Journal of Physics; Conference Series, 507(2), p.022041_1 - 022041_4, 2014/05
Times Cited Count：3 Percentile：74.32(Engineering, Electrical & Electronic)The author studied the effect of chemical compound for superconducting performance (c) of iron-based superconductors. As a result, it was revealed that BaFeAs showed high Jc. And more, BaFeAs showed higer c such as 32,000A/cm (4.2K) by being applied of 120 MPa of hot isostatic pressure (HIP). Thus, higher c performance could be achieved.
As by 320 MeV Au irradiation in single crystals and by high-pressure sintering in powder-in-tube wiresPyon, S.*; Taen, Toshihiro*; Otake, Fumiaki*; Tsuchiya, Yuji*; Inoue, Hiroshi*; Akiyama, Hiroki*; Kajitani, Hideki; Koizumi, Norikiyo; Okayasu, Satoru; Tamegai, Tsuyoshi*
Applied Physics Express, 6(12), p.123101_1 - 123101_4, 2013/12
Times Cited Count：22 Percentile：63.45(Physics, Applied)We demonstrate a large enhancement of critical current density (
) up to 1.0 
10
A/cm at 5 K under self-field in (Ba,K)FeAs single crystals by irradiating 320 MeV Au ions. With the very promising potential of this material in mind, we have fabricated a (Ba,K)FeAs superconducting wire through a powder-in-tube method combined with the hot isostatic pressing technique, whose effectiveness has been proven in industrial Bi2223 tapes. The Jc in the wire at 4.2 K has reached 37 kA/cm under self-field and 3.0 kA/cm at 90 kOe. Magneto-optical imaging of the wire confirmed the large intergranular Jc in the wire core.
