Title :
Ferroelectric-type anomalies in high-Tc heterogeneous superconductors
Author :
Kharitonov, E.V.
Author_Institution :
Positron Res. & Manufacturing Corp., Leningrad, USSR
Abstract :
In the effective medium approximation it is shown that a ferroelectric-type dielectric anomaly (∈⇒∞) takes place in percolative heterogeneous superconductors near the critical point of the smeared transition. The calculation was confirmed with experimental data on the temperature behavior of dielectric susceptibility for La1.8Sr0.2CuO4 ceramics. For the three-phase superconductor-metal-dielectric system, phase diagrams are calculated in the temperature-dielectric phase-concentration coordinates
Keywords :
ceramics; ferroelectric materials; high-temperature superconductors; lanthanum compounds; optical susceptibility; strontium compounds; La1.8Sr0.2CuO4 ceramics; critical point; ferroelectric-type dielectric anomaly; high temperature superconductor; percolative heterogeneous superconductors; smeared transition; temperature-dielectric phase-concentration coordinates; three-phase superconductor-metal-dielectric system; Conductivity; Crystals; Dielectrics; Equations; High temperature superconductors; Polarization; Superconducting transition temperature; Superconductivity; Temperature dependence; Temperature distribution;
Conference_Titel :
Applications of Ferroelectrics, 1990., IEEE 7th International Symposium on
Conference_Location :
Urbana-Champaign, IL
Print_ISBN :
0-7803-0190-0
DOI :
10.1109/ISAF.1990.200262
