Abstract

Magnetocaloric and colossal magnetoresistance effects of the layered perovskite La 1.4 Sr 1.6 Mn 2 O 7 compound have been studied. A broad peak of magnetic entropy change (-Δ S M ) is found above the Curie temperature ( T c =120 K), which can be associated with the existence of two-dimensional short range ferromagnetic order. Additionally, the curvilinear shape of Δ S M for layered perovskite is quite different from that of the Ln 1- x A x MnO 3 probably arising from magnetocrystalline anisotropy At the same time, a wide peak of colossal magnetoresitance effect near T c is found in the layered provskite La 1.4 Sr 1.6 Mn 2 O 7 .

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