Lower critical field and intragrain critical current density in the ruthenate-cuprate RuSr${}_2$Gd${}_{1.5}$Ce${}_{0.5}$Cu${}_2$O${}_{10}$

M. G. das Virgens, S. García, L. Ghivelder

The lower critical field of the grains, $H_{c1}$, and the intragrain critical current density, $J_c$, were determined for the superconducting ruthenate-cuprate RuSr${}_2$Gd$_{1.5…