Abstract
The La1−xCdxMnO3 (x=0.1, 0.2, 0.3) perovskites have been prepared by solid reaction technology with sintering temperature of 1050°C. The samples are of single phase with rhombohedral structure of R-3c symmetry. The field-cooled (FC) and zero-field-cooled (ZFC) thermomagnetic measurements at low field indicate the spin glass-like state (or cluster glass) at low temperatures and a sharp change of magnetization around the phase-transition point of composition La0.7Cd0.3MnO3. This sample exhibits large value for maximum magnetic-entropy change |ΔSm|max of 2.88J/kgK in the field of 13.5kOe and reveals giant magnetocaloric effect. This value for |ΔSm|max is larger than that of La0.7Sr0.3MnO3 and La0.7Pb0.3MnO3 perovskites. The resistance measurements show that the conductivity of La1−xCdxMnO3 perovskites is metallic at low temperatures and semiconducting at high temperatures but the metal–semiconductor transition temperatures are not coinciding with paramagnetic–ferromagnetic transition ones. The results can not be explained by using double-exchange (DE) model only. In addition to the DE Jahn–Teller lattice distortion plays an important role.
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