Enhanced the flux pinning in Bi-2223/Ag by induced Cr-ion defects

Superconducting and transport properties of (Bi–Pb)–Sr–Ca–Cu–O with Cr2O3 additions

“…The substitution also causes appreciable change in the normal-state conductivity [10]. Proper Cr doping seems to be a convenient and effective method to introduce artificial defects into the Bi2223 system as pinning centers [11]. To the best of our knowledge, Cr 2 O 3 additions in Bi-Sr-Ca-Cu-O superconductors have not yet been reported.…”

Flux pinning by Al-based nano particles embedded in polycrystalline (Bi,Pb)-2223 superconductors

“…The improvement of J c and its behavior under a magnetic field J c (H) can be obtained by introducing efficient pinning centers with a size (matching the coherence length) that can suppress the flux flow. Various methods have been used to introduce effective artificial pinning centers and to increase their number [1][2][3][4][5][6][7][8][9][10][11][12][13]. Precipitates dispersed into the superconducting matrix are often found to be an effective pinning source.…”

Superconducting and Transport Properties of (Bi-Pb)-Sr-Ca-Cu-O with Nano-Cr2O3 Additions

“…The anomalous T c-zero for the x = 0.5 wt.% sample may be due to inhomogeneity in the sample, which can affect the 5 reported that suppression of T c with increasing Cr concentration supports the pairbreaking mechanism. Hu et al 6 reported that a small amount of CrO 3 addition improved flux pinning, with effective pinning centers due to Cr substitution for Cu, while excessive Cr-ion doping degraded the superconductivity of Bi2223. Figure 4 shows the temperature dependence of J c for the pure and added samples.…”

“…5 Proper Cr doping seems to be a convenient and effective method to introduce artificial defects into the Bi2223 system as pinning centers. 6 To the best of our knowledge, nano Cr 2 O 3 additions in Bi-Sr-Ca-Cu-O superconductors have not yet been reported. The magnetic properties of Cr 2 O 3 nanoparticles have been reported to show the presence of a net magnetic moment at the surface due to the large surface-to-volume ratio which modifies the classical behavior expected for bulk antiferromagnetic particles.…”