Excess conductivity magneto conductivy and ac susceptibility studies in la ba ca cu o superconducturs

Abstract

The discovery of high transition temperature Tc superconductivity in La Ba Cu O system with Tc 30 K in1986 by Bednorz and Muller triggered the development of several high Tc Cu O based superconductors Among them Y Ba Cu O and Bi Sr Ca Cu O systems are widely studied in literature Tl Ba Ca Cu O and Hg Ba Ca Cu O systems exhibit superconductivity with large transition temperatures such as 120 and 135 K respectively However these two series are toxic in nature There are several reports