2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/17971The critical current density Jc in high-Tc superconductors (HTS) often shows a maximum at field far above the self-field. We study this peak effect(PE) with the nonlinear I-V response of type-II superconductors and find analytical equation of Jc in the dependence of filed and temperature. Theis equation is compared with some experimental data of R-Ba-Cu-O single crystals with fair agreement.3 pages, 3 figuesSuperconductivitytext