Abstract
Metamagnetic transition was observed in low magnetic field for La0.7Ca0.3MnO3−δ lanthanum manganite prepared by solid-state technology. Magnetization shape causes giant low field magnetocaloric effect at Curie temperature TC=242K. Magnetic entropy changes ΔSm, deduced with isothermal magnetization curves, are equal to 7.0 and 8.0J∕kgK in the field change from 0 to 1.0 and 2.0T, respectively. The obtained ΔSm are essentially higher than that reported before for lanthanum manganites with similar TC. The observation shows the way for the construction the magnetic refrigerants, working in the field of permanent magnets, which is beneficial for household and automotive applications.
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