2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/24387The experimental results on the magnetic response of YBCO single crystals with unidirectional twin boundary planes in low magnetic fields (0.01 - 1 Oe) are discussed. The observed non-monotone temperature dependence of magnetization is interpreted within a plausible model of a system of the Josephson weak links in the twin boundary planes and on the basis of the order parameter anisotropy.4 pages, 2 figures, the full version will be published in Low Temperature Physics (2004)SuperconductivityStrongly Correlated Electronstext