TY - JOUR
T1 - Critical current density and ultra high-voltage transmission electron microscopic image for melt-processed fine filamentary EuB2Cu 3Ox superconductors
AU - Goto, T.
AU - Watanabe, K.
AU - Ban, E.
AU - Matsui, Y.
AU - Nagai, T.
AU - Yokosawa, T.
N1 - Funding Information:
A part of this work was supported by “Nanotechnology Support Project” of the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan. This work was partly performed at the High Field Laboratory for Superconducting Materials, Institute for Superconducting Research, Tohoku University and at the National Institute for Materials Science.
PY - 2004/10/15
Y1 - 2004/10/15
N2 - We have prepared fine filamentary EuBa2Cu3O x superconductors by solution spinning and melt processing to fabricate the high-Tc superconducting wire with high-critical current density (Jc) at 77 K and high-magnetic fields. The filamentary precursor was partially melted in flowing 0.1% O2 + Ar and then oxygenated. The samples in diameter of 55 μm had well aligned texture along the filament diameter as well as the length. The Tc value of the sample was 90 K. The transport Jc for the samples was measured at 77 K in applied magnetic fields up to 14T by rotating the sample in a direction of the filament diameter. Anisotropic behaviour of the field dependence of J c along the filament diameter was detected. The sample rotated the optimized angle exhibited the highest Jc value of 11,000A/cm 2 at 77K and 14T. The transmission electron microscopic image for the filamentary EuBa2Cu3Ox superconductors was observed by using ultra high-voltage transmission electron microscope to clarify the pinning center. Intergrowth of 124-phase and nano-scale particle in the orientated 123 matrix were observed. The presence of such small-scale disorders could improve flux pinning at high fields.
AB - We have prepared fine filamentary EuBa2Cu3O x superconductors by solution spinning and melt processing to fabricate the high-Tc superconducting wire with high-critical current density (Jc) at 77 K and high-magnetic fields. The filamentary precursor was partially melted in flowing 0.1% O2 + Ar and then oxygenated. The samples in diameter of 55 μm had well aligned texture along the filament diameter as well as the length. The Tc value of the sample was 90 K. The transport Jc for the samples was measured at 77 K in applied magnetic fields up to 14T by rotating the sample in a direction of the filament diameter. Anisotropic behaviour of the field dependence of J c along the filament diameter was detected. The sample rotated the optimized angle exhibited the highest Jc value of 11,000A/cm 2 at 77K and 14T. The transmission electron microscopic image for the filamentary EuBa2Cu3Ox superconductors was observed by using ultra high-voltage transmission electron microscope to clarify the pinning center. Intergrowth of 124-phase and nano-scale particle in the orientated 123 matrix were observed. The presence of such small-scale disorders could improve flux pinning at high fields.
KW - Eu123 superconductors
KW - Field dependence of J
KW - Filamentary
KW - Ultra high-voltage TEM image
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U2 - 10.1016/j.physc.2004.08.004
DO - 10.1016/j.physc.2004.08.004
M3 - Article
AN - SCOPUS:5444251779
VL - 415
SP - 103
EP - 108
JO - Physica C: Superconductivity and its Applications
JF - Physica C: Superconductivity and its Applications
SN - 0921-4534
IS - 3
ER -