Electron magnetic resonance study in a single crystal of the colossal magnetoresistance manganite Nd0.5Sr0.5MnO3 -: art. no. 094437

We report here the results of an electron magnetic resonance study of a single crystal of the CMR manganite, Nd0.5Sr0.5MnO3. The temperature dependence of the paramagnetic g-value, the linewidth, and the intensity point to the existence of orbitally ordered short-ranged spin correlations. The magnetocrystalline anisotropy of the sample is found to split the spectra below T-C. The temperature dependence of the spectra and the angular variation of the resonance fields suggests the presence of two distinct anisotropy fields below 220 K. This is attributed to the coexistence of an A-type antiferromagnetic phase with the ferromagnetic phase down to the temperature at which a transition takes place to a charge ordered CE-type antiferromagnetic state (T-CO=T-N=148 K).