Details

Autor(en) / Beteiligte

• Claus, H.
• Yang, S.
• Paulikas, A.P.
• Downey, J.W.
• Veal, B.W.

Titel

Atomic short-range order in oxygen deficient YBa 2Cu 3O 7−σ

Ist Teil von

• Physica. C, Superconductivity, 1990, Vol.171 (3), p.205-210

Ort / Verlag

Elsevier B.V

Erscheinungsjahr

1990

Link zum Volltext

Quelle

Elsevier Journal Backfiles on ScienceDirect (DFG Nationallizenzen)

Beschreibungen/Notizen

• Low field magnetization measurements are presented for a set of oxygen deficient single crystals of YBa 2Cu 3O 7−σ. It is demonstrated that the superconducting transition temperature T c not only depends on the oxygen concentration but also on the degree of oxygen vacancy ordering of the samples. Various degrees of ordering were obtained by annealing crystals with reduced oxygen stoichiometries at various temperatures below 350°C and fast quenching them to cryogenic temperatures. Depending on oxygen stoichiometry and annealing temperature, changes in T c of up to 27 K are observed. The observed annealing and quenching behavior is explained in terms of the kinetics of vacancy short-range order in the Cu-O chains. One major conclusion is that the so-called “60 K plateau” in the plot of T c versus σ is completely absent when the crystals are in their most disordered state, i.e., with the smallest degree of vacancy short-range order.