The thermal conductivity and the electrical resistivity of highly c-axis oriented polycrystalline Bi1.85Pb0.35Sr1.90Ca2.05Cu3.05Ox in a magnetic field have been measured in the temperature range from 4.2K to 140K. The main heat carriers are phonons. The phonon thermal conductivity was analyzed by using the Tewordt-Wölkhausen expression. It indicates that phonon-phonon scattering due to umklapp process is important above 30K. For the depression of the thermal conductivity below Tc in magnetic fields, the scattering due to fluxoids was considered.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Energy Engineering and Power Technology
- Electrical and Electronic Engineering