Effect of Zn substitution for Cu sites in the 110-K phase of (Bi,Pb)-Sr-Ca-Cu-O superconductors

Effect of magnetic and nonmagnetic impurities (Ni, Zn) substitution for Cu inBi2(SrCa)2+nKuo1, Schneider2, Skove3 et al. 1997Phys. Rev. B810420View full textAdd to dashboardCite

“…2 This may not be the case in Bi 2 ͑SrCa͒ 2ϩn (Cu 1Ϫx M x ) 1ϩn O y ͑BSCCO͒, where Zn and Ni impurities have been reported to decrease T c equally. [3][4][5][6][7][8][9][10][11] Since the amount of Zn which can be dissolved in BSCCO is limited, these studies are difficult. We have repeated these studies in ''whisker'' crystals that have the advantage of narrow transitions, easy growth of alloys, and short oxygen annealing times.…”

IMPACT OF Zn SUBSTITUTION ON PHASE FORMATION AND SUPERCONDUCTIVITY OF Bi1.6Pb0.4Sr2Ca2Cu3-xZnxO10-δ WITH x = 0.0, 0.015, 0.03, 0.06, 0.09 AND 0.12

“…Zn substitution in HTSC was considered to be anomalous and most interesting in the beginning of HTSC invention itself, in particular due to the reason that the substitution of magnetic divalent ion Ni at Cu-site showed five times smaller T c depression rate than that of non-magnetic ion Zn 2+ at the same site [4][5][6][7][8]. Cu/Zn substitution of around more than 1at% [19,20].…”

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Cu/Zn substitution of around more than 1at% [19,20].In the present letter in order to revisit the Zn substitution in Bi-2223 system, we carefully synthesized these compounds and characterized them for phase formation,

RESULTS AND DISCUSSIONThe Structural phase characterization was carried out by powder X-ray diffraction employing Cu K radiation and the XRD data corresponding to all the samples are plotted 4 in figure 1. It is seen in the diffraction pattern that Zn doping only has little effect on reflection-intensity profile as a function of the angle of diffraction.

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