High-Tc Superconductivity in New Oxide Systems II

Abstract

Superconducting transitions observed by resistivity measurements for several new systems of L-M-Cu-O, where L=Tm, Er, Ho, Dy, Eu and Lu, and M=Ba are reported. Although all of the elements L except for Lu have magnetic moment, the transition temperature T _c is as high as almost 100 K. This is suggestive that the M-Cu-O or Cu-O system has an essential role for the high-T _c superconductivity.