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

Volume

12

Issue

1

fYear

2002

fDate

3/1/2002 12:00:00 AM

Firstpage

1124

Lastpage

1127

Abstract

The ab-plane thermal conductivity κ_ab(T), thermal diffusivity α_ab(T) and thermoelectric power S_ab(T) were measured for the highly-oriented Ag-doped superconducting materials Sm_1+2xBa_2+xCu_3+xO_7+5x (X = 0.1 ∼ 0.4) prepared by a melt process. The absolute value of κ_ab and its characteristic enhancement below T_c 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 κ_ab(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 Sm_1+2xBa_2+xCu_3+xO_7+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;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/TASC.2002.1018599

Filename

1018599