Abstract
It has been found that the magnetic susceptibility of (Sm0.5Gd0.5)0.55Sr0.45MnO3 ceramic samples in zero external magnetic field exhibits a sharp peak near the temperature of 48.5 K with a small temperature hysteresis that does not depend on the frequency of measurements and is characteristic of the phase transition to an antiferromagnetic state with a long-range charge orbital ordering, which is accompanied by an increase in the magnetic susceptibility with a decrease in the temperature. The magnetization isotherms in static and pulsed magnetic fields at temperatures below 60 K demonstrate the occurrence of an irreversible metamagnetic transition to a homogeneous ferromagnetic state with a critical transition field independent of the measurement temperature, which, apparently, is associated with the destruction of the insulating state with a long-range charge ordering. In the temperature range 60 K ≤ T ≤ 150 K, the ceramic samples undergo a magnetic-field-induced reversible phase transition to the ferromagnetic state, which is similar to the metamagnetic transition in the low-temperature phase and is caused by the destruction of local charge/orbital correlations. With an increase in the temperature, the critical transition fields increase almost linearly and the field hysteresis disappears. Near the critical fields of magnetic phase transitions, small ultra-narrow magnetization steps have been revealed in pulsed fields with a high rate of change in the magnetic field of ∼400 kOe/μs.
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Original Russian Text © F.N. Bukhanko, 2012, published in Fizika Tverdogo Tela, 2012, Vol. 54, No. 6, pp. 1128–1135.
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Bukhanko, F.N. Metamagnetic phase transitions induced by static and pulsed fields in (Sm0.5Gd0.5)0.55Sr0.45MnO3 ceramics. Phys. Solid State 54, 1199–1206 (2012). https://doi.org/10.1134/S106378341206008X
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DOI: https://doi.org/10.1134/S106378341206008X