Superconductivity above 100 K in the Bi-Ca-Sr-Cu-O system
Sarkisyan A. G. , Arutyunyan V. M. , Akopyan R. S. , Vartanyan R. S. , Putnyn' E. V. , Dobrovol'skii N. M., Gevorkyan S. G.
A superconducting transition in the temperature interval 100-130 К has been observed in addition to the primary superconducting transition at Tc > 80 К in the Bi-Ca-Sr-Cu-O system. A diamagnetic transition has been observed above 260 K; it may be caused by a new superconducting phase.