⁵⁵Mn NMR AND MAGNETIZATION STUDIES OF La_xSr_{1 - x}MnO₃

Abstract

The 55 Mn NMR has been measured in La x Sr 1 - x MnO 3 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.