Скачать полную версию статьи (в PDF формате)
A. I. RYKOVA, A. S. CHERNYY, E. N. KHATS’KO, and F. N. BUKHAN’KO
«Magnetic Properties of NdMnO3.1 at Low Temperatures»
PACS numbers: 75.30.Cr, 75.30.Kz, 75.30.Wx, 75.40.Cx, 75.50.Ee, 75.60.Ej, 75.75.Cd
The temperature dependences of magnetic susceptibility of NdMnO3.1 manganite and diluted La0.1Nd0.9MnO3.1 are measured within the temperature range from 300 to 0.5 K and magnetic fields up to 3.5 kOe using different regimes of cooling (ZFC and FC regimes). The existence of manganese ions with different valence in oxides results in coexistence of ferromagnetic and antiferromagnetic nanoscale phases. This leads to clear distinguishes between the ?ZFC(T) and ?FC(T) curves for all experimental magnetic fields. The ?(T) dependences of both samples demonstrate two pronounced anomalies close to 11 K and 60 K. Near 60 K, ?(T) curves exhibit anomaly, which is typical for the phase transition to a ferromagnetically ordered state. Near 11 K, the Nd3? sublattice ordering takes place. The field dependences of magnetization M of manganites are investigated in the temperature range from 0.5 K to 100 K for magnetic field up to 20 kOe. The M(H) curves for both compounds demonstrate hysteresis loops. In NdMnO3.1 sample, a metamagnetic-like transition is observed, when some of antiferromagnetic clusters overturn into ferromagnetic state under influence of the applied field. In this process, a role of the ordered Nd3? subsystem seems to be important.