Abstract
AbstractRare‐earth doped YBa2Cu3O7–δ samples were synthesized starting from the corresponding oxides Y2O3, Yb2O3, Er2O3, 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 (Tc,0) was determined by measuring the resistivity‐temperature dependence using a classical four point measurement approach. Under optimal conditions with respect to the material composition and the oxygen treatment an unusual high zero resistance temperature of 97.5 K (Tc,onset ≈ 101 K) was achieved. This represents an increase of Tc,0 by 7.5 K. The oxygen treatment could not be monitored by IR spectroscopy, X‐ray fluorescence spectroscopy, and X‐ray powder diffraction. The results showed good reproducibility.
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