The transition temperature, Tcthe upper critical field, Hc2(T), and the critical current density, Jc(H), at 4.2 K have been studied in high-Tc YxBa1-xCu-Oxide system. Two maxima in Tc around x=0.33 and 0.4 have been observed. The slope dHc2middT near Tc for the sample x=0.4 is -1.5 T/K, resulting in Hc2 at 0 K higher than 85 T by an extrapolation according to the WHH theory. Although the Jc value of ∼3.5 A/cm2 at 15 T is very low, it decreases only 10% even at 27 T, showing high potential for practical use at high fields when Jc is raised by the introduction of strong pinning centers in this material.
ASJC Scopus subject areas
- Physics and Astronomy(all)