MAGNETOTHERMAL CONDUCTIVITY OF LA0.8CA0.2MNO3

We have studied thermal conductivity, thermopower, and resistivity of bulk polycrystalline La0.8Ca0.2MnO3. Large changes in the magnetotherm al conductivity of about 15% and the thermopower as large as 80% were found in addition test large magnetoresistivity of 80% around the magn etic transition temperature at 240 K. The temperature dependence of th e thermal conductivity displays a striking dip, while the resistivity and the thermopower have a peak near 240 K. The temperature and held d ependences of the thermal conductivity are attributed to the scatterin g of the phonons by spin fluctuations.