Abstract
The temperature dependences of the residual magnetization in narrow-band manganites (Pr0.67Ca0.33MnO3, Sm0.55Sr0.45Mn18O3, Sm0.55Sr0.45Mn16O3, and (NdEu)0.55Sr0.45Mn18O3) have been studied. All compounds studied are characterized by a fairly high residual magnetization M R (about 0.5 μB/Mn) at 4.2 K, which vanishes upon sample heating to the temperature T RE ≈ 30–35 K, which is much lower than the temperature T C of the ferromagnetic transition. However, upon magnetization of the samples at T RE < T < T C , the residual magnetization (smaller in magnitude) remains up to T C . For the composition (NdEu)0.55Sr0.45Mn18O3, the residual magnetization remains at T < T C , independent of the temperature of magnetization. The disappearance of the residual magnetization found at intermediate temperatures is apparently related to the destruction of the magnetic field-induced ferromagnetic ordering (which contains an additional contribution of the rare-earth sublattice).
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