352 citations · 2k across the 25 of their papers we have counts for
23 papers · 1 filter
Exploration of new superconductors and functional materials and fabrication of superconducting tapes and wires of iron pnictides
Hideo Hosono, Keiichi Tanabe, Eiji Takayama-Muromachi +6
This paper reviews the highlights of a 4-years-long research project supported by the Japanese Government to explore new superconducting materials and relevant functional materials…
High transport Jc in magnetic fields up to 28 T of stainless steel/Ag double sheathed Ba122 tapes fabricated by scalable rolling process
Zhaoshun Gao, Kazumasa Togano, Akiyoshi Matsumoto +1
The recently discovered iron-based superconductors with very high upper critical field and small anisotropy have been regarded as a potential candidate material for high field appl…
Achievement of practical level critical current densities in PIT Ba1-xKxFe2As2/Ag tapes by conventional cold mechanical deformation
Zhaoshun Gao, Kazumasa Togano, Akiyoshi Matsumoto +1
We found that transport critical current density (Jc) of the Ba1-xKxFe2As2/Ag tapes is significantly enhanced by the combination process of cold flat rolling and uniaxial pressing.…
Large enhancement of transport critical current density of ex-situ PIT Ag/(Ba,K)Fe2As2 tapes achieved by applying cycles of cold deformation and heat treatment
Kazumasa Togano, Zhaoshun Gao, Akiyoshi Matsumoto adn Hiroaki Kumakura
We report that high transport critical current density exceeding 104 A/cm2 at 4.2 K and 10 T can be obtained with good reproducibility for Ag sheathed (Ba,K)Fe2As2 (Ba 122) tapes b…
Phase diagram and superconductivity at 58.1 K in α-FeAs free SmFeAsO1-xFx
Masaya Fujioka, Saleem James Denholme, Toshinori Ozaki +9
The Phase diagram of SmFeAsO1-xFx in terms of x is exhibited in this study. SmFeAsO1-xFx from x = 0 to x = 0.3 were prepared by low temperature sintering with slow cooling. The low…
Large transport critical currents and magneto-optical imaging of textured Sr1-xKxFe2As2 superconducting tapes
Yanwei Ma, Chao Yao, Xianping Zhang +7
We report the temperature dependence of the transport critical current density (Jc) in textured Sr1-xKxFe2As2/Fe (Sr122) tapes fabricated by an ex situ powder-in-tube process. Crit…
Enhanced high-field transport critical current densities observed for the ex-situ PIT processed Ag/(Ba,K)Fe2As2 thin tapes
K. Togano, Z. S. Gao, H. Taira +6
We found that the transport Jc of the ex-situ PIT processed (Ba,K)Fe2As2 (Ba-122) wire with single Ag sheath can be significantly enhanced by repeating the combined process of roll…
Enhancement of superconducting properties in FeSe wires using a quenching technique
Toshinori Ozaki, Yoshikazu Mizuguchi, Satoshi Demura +9
Enhancements of superconducting properties were observed in FeSe wires using a quenching technique. Zero resistivity was achieved at about 10 K in quenched wires, which is about 2…
Effective Ex-Situ Fabrication of F-Doped SmFeAsO Wire for High Transport Critical Current Density
Masaya Fujioka, Tomohiro Kota, Masanori Matoba +4
We demonstrate the fabrication of superconducting SmFeAsO1-xFx (Sm-1111) wires by using the ex-situ powder-in-tube technique. Sm-1111 powder and a binder composed of SmF3, samarium…
Large Transport Critical Current Densities of Ag Sheathed (Ba,K)Fe2As2+Ag Superconducting Wires Fabricated by an ex-situ Powder-in-Tube (PIT) Process
Kazumasa Togano, Akiyoshi Matsumoto, Hiroaki Kumakura
We report large transport critical current densities observed in Ag-added (Ba,K)Fe2As2 superconducting wires prepared by an ex-situ powder-in-tube (PIT) process. The wire has a sim…
Fabrication of binary FeSe superconducting wires by novel diffusion process
Toshinori Ozaki, Keita Deguchi, Yoshikazu Mizuguchi +5
We report successful fabrication of multi- and mono-core FeSe wires with high transport critical current density Jc using a simple in-situ Fe-diffusion process based on the powder-…
Transport properties and microstructure of mono- and seven-core wires of FeSe1-xTex superconductor by Fe-diffusion powder-in-tube method
Toshinori Ozaki, Keita Deguchi, Yoshikazu Mizuguchi +6
We report the successful fabrication of mono- and seven-core superconducting wires of FeSe1-xTex using an in-situ Fe-diffusion process based on the powder-in-tube (Fe-diffusion PIT…
Fabrication of the iron-based superconducting wire using Fe(Se, Te)
Yoshikazu Mizuguchi, Keita Deguchi, Shunsuke Tsuda +4
We have fabricated the Fe(Se, Te) superconducting wire by a special process based on a powder-in-tube method. The pure Fe tube plays the role of not only the sheath but also the ra…
Correlation between doping induced disorder and superconducting properties in carbohydrate doped MgB2
J. H. Kim, S. X. Dou, Sangjun Oh +4
A comprehensive study of the effects of carbohydrate doping on the superconductivity of MgB2 has been conducted. In accordance with the dual reaction model, more carbon substitutio…
Fabrication of high performance MgB2 wires by an internal Mg diffusion process
J. M. Hur, K. Togano, A. Matsumoto +3
We succeeded in the fabrication of high-Jc MgB2/Fe wires applying the internal Mg diffusion (IMD) process with pure Mg core and SiC addition. A pure Mg rod with 2 mm diameter was p…
Enhancement of in-field Jc in MgB2/Fe wire using single and multi-walled nanotubes
J. H. Kim, W. K. Yeoh, M. J. Qin +6
We investigated the doping effects of SWCNTs and MWCNTs on the Tc, lattice parameters, Jc(B), microstructure, and Hc2 of MgB2/Fe wire. These effects systematically showed the follo…
Effect of aromatic hydrocarbon addition on in situ powder-in-tube processed MgB2 tapes
H. Yamada, M. Hirakawa, H. Kumakura +1
We fabricated in situ powder-in-tube processed MgB2/Fe tapes using aromatic hydrocarbon of benzene, naphthalene, and thiophene as additives, and investigated the superconducting pr…
Upper Critical Field of a Novel 18-K Superconductive Phase in Metastable Yttrium Sesquicarbide Prepared Using High Pressure Technique
T. Nakane, T. Mochiku, H. Kito +4
The metastable phase of an yttrium sesquicarbide compound, which was vary recently reported as a new superconductive phase with a Tc value of 18 K, was prepared under high pressure…
Improvement of critical current density in Fe-sheathed MgB2 tapes by ZrSi2, ZrB2 and WSi2 doping
Yanwei Ma, H. Kumakura, A. Matsumoto +2
Fe-sheathed MgB2 tapes were prepared through the in situ powder-in-tube technique by 5 at.% ZrSi2, ZrB2 and WSi2 doping, respectively. The doping effect of these compounds on the m…
A New Approach for the Fabrication of MgB2 Superconducting Tape with Large In-field Transport Critical Current Density
K. Komori, K. Kawagishi, Y. Takano +5
The paper reports the first successful fabrication of MgB2 superconducting tape using a flexible metallic substrate as well as its strong pinning force, which was verified by direc…
Strain Effect in MgB2/Stainless Steel Superconducting Tape
H. Kitaguchi, H. Kumakura, K. Togano
The influence of mechanical strain on the critical current (Ic) is investigated for MgB2/stainless steel (SUS316) superconducting tapes. The tapes are fabricated by using 'powder i…
High transport critical current density obtained for Powder-In-Tube-processed MgB2 tapes and wires using stainless steel and Cu-Ni tubes
H. Kumakura, A. Matsumoto, H. Fujii +1
MgB2 tapes and wires were fabricated by the Powder-In-Tube method. Stainless steel and Cu-Ni tubes were used as sheath materials, and no heat treatment was applied. The tapes made…
Superconducting Properties of MgB2 Bulk Materials Prepared by High Pressure Sintering
Y. Takano, H. Takeya, H. Fujii +5
High-density bulk materials of a newly discovered 40K intermetallic MgB2 superconductor were prepared by high pressure sintering. Superconducting transition with the onset temperat…