Ferromagnetism and frustration in Nd0.7Sr0.3MnO3

Dynamic magnetic properties of the colossal magnetoresistance ferromagnet N do(0.7)Sr(0.3)MnO(3) have been explored by ac-susceptibilities and dc-magne tization measurements. The system orders magnetically below T(c)approximate to 235 K with a large difference between zero-field-cooled and field-coole d magnetization in low fields. Both the in-phase and out-of-phase component s of the susceptibility are frequency dependent in the ferromagnetic phase. The system shows long-time relaxation of the zero-field-cooled magnetizati on and age-dependent effects at all temperatures below T-c. The observed re sults evidence the existence of frustration and magnetic disorder in Nd0.7S r0.3MnO3, but there is no indication of a re-entrant phase transition down to 5 K.