Filamentary Superconductivity in the New 2212-Type Compound (Pb0.5Cu0.5)2(Ba0.5Sr0.5)2YCu2O8

C. L. Yang；Y. Y. Hsu；J. H. Shieh；Y. M. Wan；H. C. Ku

Chinese Journal of Physics

34卷2S期（1996 / 04 / 01）

579 - 582

英文

Filamentary superconductivity have been observed below Tc of 14 K for sintered-polycrystalline (Pb0.5Cu0.5)2(Ba0.5Sr0.5)2YCu2O8 samples. Low electrical resistivity shows that this semiconducting sample is near the boundary of metal-insulator transition. The observed filamentary superconductivity indicates that the oxygen concentration of the sample (Pb0.5Cu0.5)2(Ba0.5Sr0.5)2YCu2O8-6 is inhomogeneous. The oxygen off-stoichiomerric parameter 6 plays the role of controlling the variation of free charge carriers in this electronically inhomogeneous sample where part of the sample is across the transition boundary and thus becomes superconducting.