Solid-state reactions of Y 2 O 3 , BaCO 3 , and CuO mixtures at stoichiometric ratios of YBa 4 Cu 6 O x reveal superconducting products having quite interesting and unusual properties. For instance, superconducting transition T c at 90 K even without annealing in oxygen flow could be observed. Existence of a ferromagnetic-like behavior was recognized at low temperatures and magnetic fields greater than 1 T. Critical current densities are higher than the one expected from a polycrystalline superconductor. In addition, intergranular J ct -values obtained from the transport measurements show strong magnetic field dependency. Magnetic fields of $6.4 Oe decrease J ct by about 62% in magnitude. These materials seem to be good candidate for a low field sensor in superconducting gaussmeters.