The influence of substitution of Ba2+ with Sr2+ on the superconducting and magnetic properties of ceramic DyBa2Cu3O7-δ samples with various oxygen contents has been investigated. The temperature and field dependences of magnetization and magnetic susceptibility of DyBa2-xSrxCu3O7-δ compounds with x=0, 0.5, and 1.0, were measured. The diamagnetic effect, the val ue of the intergrain critical field Hc1J, and the superconducting transition temperature Tc, were found to decrease while the intragrain critical field Hc1 and the width of the superconducting transition increased as the strontium content increased. The magnetic phase diagram H-T constructed for DyBa1.5Sr0.5Cu3O7-δ and DyBaSrCu3O7-δ compounds is topologically identical wit h the phase diagram of DyBa2Cu3O7-δ where one Hc (T) line of the antiferromagnetic-paramagnetic transition in the magnetic field is seen. It was shown that the replacement of Ba2+ by Sr2+ leads to an enhancement of the low-dimensional properties. This is manifested by the appearance of a significant difference between the temperature of maximum χ (T), characterizing 2D magnetic correlations, and the Neel temperature, TN, corresponding to a 3D ordering. In the DyBa2-xSrxCu3O7-δ system ther e is a structural phase transition with a heat absorption at the temperature of about 2.4 K.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Energy Engineering and Power Technology
- Electrical and Electronic Engineering