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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| [4] | J.M.D. Coey and M. Viret: Adv. Phys, 1999, 48, 167. [2] M.B. Salamon and M. Jaime: Rev. Mod. Phys, 2001, 73, 583.[3] P. Schi® |
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