ELECTRICAL-RESISTIVITY AND THERMAL-CONDUCTIVITY OF NDBA2(CU1-ZZNZ)(3)O7-Y AND THE PHONON TRANSPORT MODEL

The electrical resistivity of NdBa2(Cu1-ZZnZ)(3)O7-y as a function of temperature from 4.2K to room temperature and the thermal conductivity of the samples in the temperature range from 4.2K to 120K have been m easured. As is consistent vith the most previous reports, it shows tha t the thermal conductivity of the samples exhibit a peak at a temperat ure below T-c. The thermal conductivity of the electrons can be calcul ated from the resistivity of sample, which is rather small than the ex perimental results of the samples. Therefore, the main heat carriers a re believed to be phonons. Then the measured thermal conductivity was separated into electron and phonon contributions, and the phonon therm al conductivity were analyzed by using the theory of Tewordt-Wolkhause n.