Oxygen Plasma Effects on Zero Resistance Behavior of Yb,Er‐doped YBCO (123) Based Superconductors

Abstract

Abstract. Rare-earth doped YBa 2 Cu 3 O 7-δ samples were synthesized starting from the corresponding oxides Y 2 O 3 , Yb 2 O 3 , Er 2 O 3 , CuO as well as Ba(OH) 2 by heating to 950°C under air. The doping concentrations were adjusted to 15 % Yb, 7 % Er and 20 % Yb, 15 % Er, respectively, with respect to the yttrium content. The orthogonal phased (123) YBCO ceramics were exposed to an oxygen plasma for 140 and 380 min. Zero resistance temperature (T c,0 ) was determined by measur-