scholarly journals Enhancement of critical current density in Co-dopedBaFe2As2with columnar defects introduced by heavy-ion irradiation

2009 ◽  
Vol 80 (1) ◽  
Author(s):  
Y. Nakajima ◽  
Y. Tsuchiya ◽  
T. Taen ◽  
T. Tamegai ◽  
S. Okayasu ◽  
...  
Keyword(s):  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
Ion Irradiation ◽  
Heavy Ion ◽  
Heavy Ion Irradiation ◽  
Columnar Defects

Effect of High-Energy Heavy-Ion Irradiation on the Critical Current Density of Bi-2212 Single Crystals

1998 ◽  
pp. 481-484 ◽  
Author(s):  
Kouji Ogikubo ◽  
Tomohiro Kobayashi ◽  
Takayuki Terai ◽  
Satoru Tanaka ◽  
Kouji Kishio ◽  
...  
Keyword(s):  
Critical Current Density ◽  
Single Crystals ◽  
Critical Current ◽  
Current Density ◽  
Ion Irradiation ◽  
Heavy Ion ◽  
High Energy ◽  
Heavy Ion Irradiation

Effect of high-energy heavy-ion irradiation on the critical current density of Bi-2212 single crystals

1997 ◽  
Vol 282-287 ◽  
pp. 2135-2136 ◽  
Author(s):  
T. Terai ◽  
T. Kobayashi ◽  
K. Kishio ◽  
J. Shimoyama ◽  
S. Okayasu ◽  
...  
Keyword(s):  
Critical Current Density ◽  
Single Crystals ◽  
Critical Current ◽  
Current Density ◽  
Ion Irradiation ◽  
Heavy Ion ◽  
High Energy ◽  
Heavy Ion Irradiation

scholarly journals Modification of Critical Current Density Anisotropy in High-Tc Superconductors by Using Heavy-Ion Irradiations

2021 ◽  
Vol 5 (2) ◽  
pp. 16
Author(s):  
Tetsuro Sueyoshi
Keyword(s):  
Magnetic Field ◽  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
Ion Irradiation ◽  
Heavy Ion ◽  
High Tc Superconductors ◽  
High Tc ◽  
Heavy Ion Irradiation ◽  
The Magnetic Field

The critical current density Jc, which is a maximum value of zero-resistivity current density, is required to exhibit not only larger value but also lower anisotropy in a magnetic field B for applications of high-Tc superconductors. Heavy-ion irradiation introduces nanometer-scale irradiation tracks, i.e., columnar defects (CDs) into high-Tc superconducting materials, which can modify both the absolute value and the anisotropy of Jc in a controlled manner: the unique structures of CDs, which significantly affect the Jc properties, are engineered by adjusting the irradiation conditions such as the irradiation energy and the incident direction. This paper reviews the modifications of the Jc anisotropy in high-Tc superconductors using CDs installed by heavy-ion irradiations. The direction-dispersion of CDs, which is tuned by the combination of the plural irradiation directions, can provide a variety of the magnetic field angular variations of Jc in high-Tc superconductors: CDs crossing at ±θi relative to the c-axis of YBa2Cu3Oy films induce a broad peak of Jc centered at B || c for θi < ±45°, whereas the crossing angle of θi ≥ ±45° cause not a Jc peak centered at B || c but two peaks of Jc at the irradiation angles. The anisotropy of Jc can also modified by tuning the continuity of CDs: short segmented CDs formed by heavy-ion irradiation with relatively low energy are more effective to improve Jc in a wide magnetic field angular region. The modifications of the Jc anisotropy are discussed on the basis of both structures of CDs and flux line structures depending on the magnetic field directions.

Critical current densities and flux creep rate in Co-doped BaFe2As2 with columnar defects introduced by heavy-Ion irradiation

2010 ◽  
Vol 470 (20) ◽  
pp. 1103-1105 ◽  
Author(s):  
Y. Nakajima ◽  
Y. Tsuchiya ◽  
T. Taen ◽  
H. Yagyuda ◽  
T. Tamegai ◽  
...  
Keyword(s):  
Creep Rate ◽  
Critical Current ◽  
Ion Irradiation ◽  
Heavy Ion ◽  
Flux Creep ◽  
Heavy Ion Irradiation ◽  
Columnar Defects ◽  
Current Densities ◽  
Co Doped
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