The effect of Sn substitution in the superconducting system

Abstract

We studied the effect of Sn substitution in a new mercury-based superconductor with nominal composition . At this stage of investigation the material is multiphasic with dominating superconducting phases up to x = 0.3. It was established that Sn stimulates the formation of the Hg-1212 phase and enhances the diamagnetic volume fraction but also the weak-link behaviour. Together with the SEM - EDS analysis, the shift of some of the XRD peaks, as well as the gradual decrease of with the dopant content x, suggests that the substitution is effective and some of the Sn is incorporated into the structure of the superconducting phases.

Influence of simultaneous doping of Tl and Bi on microstructure and critical current density of HgBa2Ca2Cu3O8+δ

“…Due to these, the as synthesized Hg-12(n-1)n phases are not so stable as the other HTSC phases of cuprate oxide family. Many attempts to overcome these problems have been made, but they have only limited success [5][6][7]. It is now known that partial replacement of Hg +2 in oxygen deficient HgO δ layer by cations having higher oxidation states than Hg +2 e.g.Tl +3 , Sn +4 , Bi +3 etc.…”

Structure, superconducting and magnetotransport properties of Ru1−xSnxSr2Gd1.4Ce0.6Cu2Oy(0≤x≤0.1)

“…It was established that the x 0.1 samples are not superconducting. This is not observed in other Sn-containing superconducting systems, where SC exists up to x 0.3 [9,[11][12][13][14]. Therefore the Sn-doping more rapidly destroys the SC in Ru-1222 than in conventional superconductors.…”

“…It was also shown that the Sn-doping favors the melt-texture-growth (MTG) of YBaCuO [10]. The authors of [11,12] studied the effect of Sn-substitution on the superconducting properties of the Hg-1223 and (Pb, Cu)-1212 systems. It was established that Sn stimulates the Hg-1212 phase formation and enhances both the diamagnetic volume fraction and the weak link behavior.…”

Sn doped (Cu0.5Tl0.5)Ba2Ca2Cu3−ySnyO10−δ superconductors: Effect on the diamagnetism and phonon modes

“…[2][3][4][5][6][7][8][9][10][11][12] Sn doping resulted in a significant enhancement of J c for more highly doped samples. [13][14][15] Sn ions in the 4 + valence state dominantly occupy Cu sites.…”