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The La-2125 type La2-xDyxCa2xBa2Cu4+2xOz (0.1 < x < 0.5; LDBO) compounds havebeen synthesized and studied for their structural and superconductingproperties by room temperature neutron diffraction, high field dcmagnetization, four-probe resistivity and iodometric double titration. TheRietveld analysis of the neutron diffraction data reveals tetragonal structurefor all the samples, which crystallizes into La-123 type tetragonal structurein P4/mmm space group. Iodometric double titrations were performed to determinethe oxygen content values and calculate mobile charge carrier (holes) density.The superconducting transition temperatures (Tc) increases from ~ 20 K for x =0.1 to a maximum of 75 K for x = 0.5. Flux pinning force (Fp) and criticalcurrent density (Jc), calculated from the low temperature hysteresis loops,also increases with increasing dopant concentration. The paper presents thestudies on structure and superconducting properties of all LDBO compounds inlight of the role of calcium in inducing superconductivity in the tetragonalnon-superconducting oxide.Comment: To appear in J. Phys. Condens. Matte

journal of physics. condensed matter

Structural and magnetic studies on La2 xDyxCa2xBa2Cu4+2xOztype superconducting oxides