Influence of He ion etching on superconducting transition temperature and critical current density of Bi1.6Pb0.4Sr2Ca2Cu3Ox.

Abstract

It is a serious problem that excess helium-ion etching greatly deceases superconducting transition temperature (Tc) and critical current density (Jc) of Bi1 .6 Pb 0.4 Sr 2 Ca 2 Cu3 Ox. Thus, the influence of the etching on Tc and Jc has been investigated for the Bi oxide. A critical DOSE (Dc) to maintain high Tc above 100 K is defined and evaluated. The Dc value is about 3.2x1017 (ions/mm2) for the helium-ion etching.