J Mater Sci Technol ›› 2010, Vol. 26 ›› Issue (3): 234-236.

• Mechanical and Functional Properties of Materials • Previous Articles     Next Articles

Magnetocaloric and Colossal Magnetoresistance Effect in Layered Perovskite La1:4Sr 1:6Mn2O7

Li'an Han, Changle Chen   

  1. 1) School of science, Northwestern Polytechnical University, Xi'an 710072, China
    2) Department of applied physics, Xi0an University of Science and Technology, Xi'an 710054, China
  • Received:2009-02-06 Revised:2009-07-21 Online:2010-03-28 Published:2010-03-22
  • Contact: Han Li-an
  • Supported by:

    the National Natural Science Foundation of China (Nos. 50331040 and 60171043)

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.

Key words: Magnetocaloric effect, Layered perovskite, Colossal magnetoresistance