Electronic Properties of High-Temperature Superconductor DyBa₂Cu₃O₇from Critical Fields and Specific Heat Studies

Abstract

The lower and upper critical fields, as well as the specific heat were measured as a function of temperature for good quality DyBa2Cu3O7 high-temperature superconductor in the vicinity of superconducting transition temperature T, = 91.2 K. The number of superconducting and normal state electronic quantities were determined basing on the Ginzburg-LandauAbrikosov-Gorkov theory. It is argued that on the basis of this BCS-like theory one can describe the superconducting properties and, in combination with some information on the electronic structure, also the magnetic properties of high-temperature superconductors.

Synthesis and Physicochemical Properties of Er0.5Dy0.5Ba2Cu3O6.83 Cuprate High-Temperature Superconductor

“…The sample exhibits critical temperature T c0 = (92.09 ± 0.30) K and narrow superconducting transition ∆T = (0.69±0.05) K. The definitions of T c0 and ∆T are as in [29]. For comparison, the DyBa 2 Cu 3 O 6.83 sample studied in [30] has the critical temperature T c = (91.40 ± 0.10) K and ∆T = (0.70 ± 0.10) K. Moreover, the round-shaped Er 0.5 Dy 0.5 Ba 2 Cu 3 O 6.83 pellet of thickness 3 mm and 12 mm in diameter exhibits a specific resistance about (3.30±0.15) mΩ cm, which was determined at room temperature using the van der Pauw method [31,32]. The ZFC dispersion χ and absorption χ parts of AC susceptibility are show in Fig.…”