Superconductivity in Tl1.5SrCaCu2Ox

Abstract
We have discovered superconductivity in the Tl-Sr-Ca-Cu-O system. Depending on the method of sample preparation, a number of superconducting phases with different T c's appeared. Resistivity data suggest that a T c of about 100 K is to be attained in Tl1.5Sr1Ca1Cu2O x .