THERMAL-CONDUCTIVITY OF SOLID OXYGEN DOPED WITH NONMAGNETIC IMPURITIES

Measurements of the thermal conductivity (kappa) of solid oxygen doped with nonmagnetic impurities of N-2 (0.34 and 0.94%) and Ar (1%) were made in the temperature range 1-35 K. It was shown that in the antifer romagnetic alpha phase doping with nonmagnetic impurities has a drasti c effect on low-temperature thermal conductivity which supposedly is a result of suppression of the magnon contribution to the heat transpor t by the impurities. At the same time, the jump in the thermal conduct ivity at the alpha-beta transition and the thermal conductivity in the beta phase are practically insensitive to the doping effect which we attribute to strong magnetostriction effects characteristic of the bet a phase.