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材料科学技术学报 2010
Magnetocaloric and Colossal Magnetoresistance Effect in Layered Perovskite La1:4Sr 1:6Mn2O7
Keywords: Magnetocaloric effect,Layered perovskite,Colossal magnetoresistance Abstract: Magnetocaloric and colossal magnetoresistance effects of the layered perovskite La1:4Sr1:6Mn2O7 compound have been studied. A broad peak of magnetic entropy change (-ΔSM) is found above the Curie temperature (TC=120 K), which can be associated with the existence of two-dimensional short range ferromagnetic order. Additionally, the curvilinear shape of -ΔSM for layered perovskite is quite different from that of the Ln1-xAxMnO3 probably arising from magnetocrystalline anisotropy. At the same time, a wide peak of colossal magnetoresitance effect near TC is found in the layered provskite La1:4Sr1:6Mn2O7.
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