Effect of CuCo and coupled substitution upon superconductivity in ErBa2Cu3O7 − δ

Contrasting Effects of Ca[sup 2+] and Ho[sup 3+] Substitutions on Superconductivity and Excess conductivity of (Ho[sub 1−x]Ca[sub x])(Ba[sub 2−y]Ho[sub y])Cu[sub 3]O[sub 7−δ]

“…Since the discovery of Y123, extensive investigations using elemental substitution at different atomic sites of RE123 have been carried out to investigate the role of the different atomic sites in superconductivity. On the other hand, Ca 2+ substitution at RE 3+ site causes recovery of T c in underdoped RE123 samples [1,2]. On the other hand, Ca 2+ substitution at RE 3+ site causes recovery of T c in underdoped RE123 samples [1,2].…”

“…REBa 2 Cu 3 O 7-δ (RE=Y and rare earth) superconductors posses a layered structure along the c-axis consisting of two CuO planes separated by an RE atom and large two Ba atoms, each separating Cu-O chains with a CuO plane [1]. Since the discovery of Y123, extensive investigations using elemental substitution at different atomic sites of RE123 have been carried out to investigate the role of the different atomic sites in superconductivity.…”

“…Substitutions of trivalent RE 3+ at the Ba site have been reported to lower critical temperature, T c with increasing RE 3+ concentration [1,2]. Interestingly, a combination of both Ca 2+ substitution at Nd 3+ site and La 3+ at Ba 2+ site showed hole filling by La 3+ was completely balanced by hole doping due to the Ca 2+ substitution [1,3]. Interestingly, a combination of both Ca 2+ substitution at Nd 3+ site and La 3+ at Ba 2+ site showed hole filling by La 3+ was completely balanced by hole doping due to the Ca 2+ substitution [1,3].…”

“…Interestingly, a combination of both Ca 2+ substitution at Nd 3+ site and La 3+ at Ba 2+ site showed hole filling by La 3+ was completely balanced by hole doping due to the Ca 2+ substitution [1,3]. However, to our knowledge, there are limited reports on double substitutions of Ca 2+ and RE 3+ with the same trivalent rare-earth ion existing at both the RE and Ba sites of the RE123 structure [1,2]. However, to our knowledge, there are limited reports on double substitutions of Ca 2+ and RE 3+ with the same trivalent rare-earth ion existing at both the RE and Ba sites of the RE123 structure [1,2].…”

Effect of Doping of Zn and Ca into ErBa2Cu3O7−δ Superconductor Prepared via Co-precipitation Method

“…In addition, the enhanced atomic scale mixing also contributes to a significant reduction of the heat treatment temperature and duration and unlike the conventional solid state technique, intermittent grindings are unnecessary. Previous reports have shown that by using the coprecipitation technique, samples with comparable T c were successfully produced in shorter heat treatment duration compared to samples prepared via the conventional solid state method [1,2] and [3]. The microstructure of the samples obtained via COP shows larger grain size with highly compact structure [3] and [4].…”