Enhanced Pinning Properties of Laser-Irradiated Bulk MgB2 Superconductors
Küçük Resim Yok
Tarih
2017
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Springer New York LLC
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
In order to investigate the effect of laser irradiation on the superconducting properties of MgB2, a pellet-shaped sample was produced and cut into two pieces. The dot-shaped molten patterns, with the distance of 100 µm between them, were formed on the surface of one of the pieces by using an Nd:YVO4 laser. The grains of the irradiated sample were significantly grown due to the laser-induced sintering. The modified surface appeared to have dense and compacted grains as a result of increasing interconnectivity among the superconducting grains. The critical current densities at 5 K in a field of 3 T were found to be 5.38 × 104 and 8.96 × 104 A cm?2 for the reference and the irradiated samples, respectively. The increment of critical current density for the irradiated sample is presumably connected with the changing of pinning mechanism after the laser irradiation. For the irradiated sample which showed a higher value of critical current density at 5 K under high fields, ?? pinning was obtained as a dominant pinning mechanism, while the normal point pinning was dominant for the reference one. These results point out that the superconducting properties of bulk MgB2 can be changed and improved via laser irradiation in a short time. © 2016, Springer Science+Business Media New York.
Açıklama
Anahtar Kelimeler
Critical current density, Laser irradiation, MgB2, Pinning force density, Superconductivity, Critical current density (superconductivity), Critical currents, Current density, Laser beam effects, Sintering, Superconductivity, Interconnectivity, Irradiated samples, MgB<sub>2</sub>, Pinning force density, Pinning mechanism, Pinning properties, Superconducting grains, Superconducting properties, Irradiation, Critical current density, Laser irradiation, MgB2, Pinning force density, Superconductivity, Critical current density (superconductivity), Critical currents, Current density, Laser beam effects, Sintering, Superconductivity, Interconnectivity, Irradiated samples, MgB<sub>2</sub>, Pinning force density, Pinning mechanism, Pinning properties, Superconducting grains, Superconducting properties, Irradiation
Kaynak
Journal of Superconductivity and Novel Magnetism
WoS Q Değeri
Q4
Scopus Q Değeri
Q3
Cilt
30
Sayı
3
