Abstract
The magnetic measurements have been carried out in single phase, polycrystalline superconducting sample---DyBa 2 Cu 3 -O 7−x compound. The magnetization anomaly at 12–13 K range under the external magnetic field is observed and considered as the evidence of an antiferromagnetic ordering in this compound. From the experimental data of lower and upper critical fields, we deduce the crucial normal and superconducting parameters such as H c (O); k GL ; γ; λ ep ; and etc. Using the Allen-Dynes strong e-p coupling Tc formula, we estimate the value of Tc and find a well coincidence with the experimental results. We believe that the phonon-mediated electron-pairing mechanism may be possible to explain the 90 K superconductivity.
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