55Mn NMR and Magnetization Studies of LaXSr1-XMnO3

The ⁵⁵Mn NMR has been measured in La_xSr_1-xMnO₃ for x=0.2 and 0.3 as a function of temperature, in zero field and in field. The samples had a room temperature resistivity of 10^-4 ohm-cm, and the magnetizarion showed a sharp FM transition 312 K. The zero field FM frequency follows T^3/2 power law at both x values consistent with the simple magnon model. A second feature at lower frequency of uncertain origin is observed.