Influence of aging on fishtail-effect in pure and Ag-doped MG-YBCO

D. Lotnyk, R. V. Vovk, M. A. Obolenskii +7

$M(B)$-curves were experimentally investigated. Fishtail-effect (FE) was observed in MG YBa${}_2$Cu${}_3$O${}_{7-\delta }$ and YBa${}_2$(Cu${}_{1-x}$Ag${}_x$)${}_3$O${}_{7-\delta }$ (at $x\approx$ 0.02) crys…