A study by specific heat of a polycrystalline sample of the low-dimensional magnetic system Y2BaCuO5 is presented. Magnetic fields up to 14 T are applied and permit to extract the (T ,H) phase diagram. Below μ0H ∗ ≃ 2 T, the Néel temperature, associated with a three-dimensional antiferromagnetic long-range ordering, is constant and equals TN = 15.6 K. Above H ∗, TN increases linearly with H and...

Mechanical properties of the orthorhombic phase of YBa2Cu3O7-δ (Y-123) at room temperature have been investigated at different applied loads using nanoindentation technique. The study was carried out for several monodomains on the (001) planes for textured Bridgman samples with dispersed Y2BaCuO5 (Y-211) particles as pinning centers. The yield strength (σys), shear stress (τm) and toughness (KI...

YBCO bulk single-grain samples with the nominal composition Y1.5Ba2(Cu1-xAlx)3Oy were fabricated by the Top – Seeded Melt – Growth process. Aluminium was found to be a suitable chemical dopant in Y1Ba2(Cu1-xAlx)3O7/Y2BaCuO5 bulk superconductors, which introduces effective nanosized pinning centres. An increase of the critical current density, Jc, and the appearance of a peak effect were observe...