Title :
Thermal conductivity, thermal diffusivity and thermoelectric power of Sm-based bulk superconductors
Author :
Fujishiro, Hiroyuki ; Kohayashi, Shuichi
Author_Institution :
Fac. of Eng., Iwate Univ., Morioka, Japan
fDate :
3/1/2002 12:00:00 AM
Abstract :
The ab-plane thermal conductivity κab(T), thermal diffusivity αab(T) and thermoelectric power Sab(T) were measured for the highly-oriented Ag-doped superconducting materials Sm1+2xBa2+xCu3+xO7+5x (X = 0.1 ∼ 0.4) prepared by a melt process. The absolute value of κab and its characteristic enhancement below Tc were suppressed with increasing content X of the Sm2BaCuO5 (Sm211) secondary phase, while they were enhanced with increasing content of doped-Ag. The application of the magnetic field up to 10 T clarified that the phonon scattering by vortices was most enhanced with the applied field perpendicular to the ab-plane. The trapped magnetic field also seriously suppressed the κab(T) enhancement.
Keywords :
barium compounds; flux pinning; high-temperature superconductors; phase separation; phonons; samarium compounds; silver; thermal conductivity; thermal diffusivity; thermoelectric power; 10 T; Ag content; Ag-doped Sm1+2xBa2+xCu3+xO7+5x; Sm-based bulk superconductors; Sm211; Sm1Ba2Cu3O7:Ag; Sm2BaCuO5 secondary phase; ab-plane thermal conductivity; magnetic field effect; melt process preparation; phonon scattering; thermal diffusivity; thermoelectric power; trapped magnetic field; vortices; Conductivity measurement; Magnetic field measurement; Magnetic fields; Particle scattering; Power measurement; Superconducting magnets; Superconducting materials; Superconductivity; Thermal conductivity; Thermoelectricity;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
DOI :
10.1109/TASC.2002.1018599
