Detection of surface (∼1 μm) impurity phases in high T c superconductors

6 March 1989

journal article
research article
Published by AIP Publishing in Applied Physics Letters

Vol. 54 (10) , 960-962
https://doi.org/10.1063/1.101419

Abstract

We show that thermally stimulated luminescence is an important method for detecting insulating impurity phases that commonly occur in high T_c superconductors. The technique is sensitive to impurity phases at 2O₃, Y₂BaCuO₅, YBa₂Cu₃O_6.2, BaCO₃, Ba₃CuO₄, BaCuO₂, and YBa₂Cu₃O_x (x≊7) were investigated. All but the high quality sintered pellets of YBa₂Cu₃O_x exhibited relatively intense luminescence. The absence of luminescence, and thus of insulating phases, is correlated with low values of rf surface resistance.

Keywords

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