Features of the Elastic Properties of HTSC Ceramics in the Transition Zone to the Superconducting Phase

Abstract

The article presents the results of studies of the elastic properties of the YBa₂Cu₃O_{(7 –x)} high-temperature superconducting ceramic in the vicinity of the phase transition to the superconducting state at a temperature of 91.3 K and room temperature of 293 K. Near the phase transition temperature with a width of ~10 K, a local increase in longitudinal nonlinear acoustic parameter N was revealed for the first time, which characterizes anharmonic interatomic interaction in the material. Experimental studies of the linear and nonlinear elastic properties of the YBa₂Cu₃O_{(7 –x)} HTSC ceramic near the superconducting transition zone show that the electronic phase transition significantly influences its elastic properties.