Structural and superconducting properties in Y0.6Gd0.4Ba2(Nb)Cu3O7-y cuprates doped with niobium
Küçük Resim Yok
Tarih
2012
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Elsevier Science Bv
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
Polycrystalline YBa2Cu3O7-y (YBCO) and Y0.6Gd0.4Ba2-xNbxCu3O7-y (YGBNCO) compounds with 0 <= x <= 0.225 were synthesized using standard solid state reaction technique. The structure for all samples was characterized by X-ray difference (XRD) and scanning electron microscopy (SEM). The transport properties were measured by the (FPP) method in the temperature range from 70 to 130 K. As the Nb content in the samples increased, a diffused phase indicating a niobium perovskite phase and a small amount of unidentified phase appeared. With the increase of Nb content, the superconducting transition temperature T-c(onset) increased slowly with x <= 0.125, and then it remained unchanged or slowly decreased with 0.125 <= x <= 0.225. It could be found that there was a slow decrease of zero-resistance temperature, T-c(offset), with the increase of Nb content. The larger transition width might result from the YBa2NbO6 phase, impurity and unidentified phases of the sample due to the Nb doping.
Açıklama
Anahtar Kelimeler
Y0.6gd0.4ba2cu3o7-Y Cuprates, Gd And Nb Co-Doping, Structural And Superconducting Properties, Rare Earths
Kaynak
Journal Of Rare Earths
WoS Q Değeri
Q2
Scopus Q Değeri
Q1
Cilt
30
Sayı
3
