Magnetocaloric and Colossal Magnetoresistance Effect in Layered Perovskite La_(1.4)Sr_(1.6)Mn_2O

材料科学技术（英）, 2010, 26(3): 234-236.

^1, , ^2,

1.School of science, Northwestern Polytechnical University, Xi'an 710072, China; Department of applied physics, Xi'an University of Science and Technology, Xi'an 710054, China

2.School of science, Northwestern Polytechnical University, Xi'an 710072, China

基金项目: the National Natural Science Foundation of China(50331040;60171043)

Magnetocaloric and Colossal Magnetoresistance Effect in Layered Perovskite La_(1.4)Sr_(1.6)Mn_2O_7

Li'an Han ^1, , Changle Chen ^2,

1.School of science, Northwestern Polytechnical University, Xi'an 710072, China; Department of applied physics, Xi'an University of Science and Technology, Xi'an 710054, China

2.School of science, Northwestern Polytechnical University, Xi'an 710072, China

Keywords： Magnetocaloric effect

Magnetocaloric and colossal magnetoresistance effects of the layered perovskite La_(1.4)Sr_(1.6)Mn_2O_7 compound have been studied. A broad peak of magnetic entropy change (-△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 -△S_M for layered perovskite is quite different from that of the Ln_(1-x)A_xMnO_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_(2O7).

参考文献

[1]	X. Bohigas;J. Tejada;M.L. Marinez-Sarrion .Magnetic and calorimetric measurements on the magnetocaloric effect in La_(0.6)Ca_(0.4)MnO_(3)[J].Journal of Magnetism and Magnetic Materials,2000(1/2):85-92.

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Magnetocaloric and Colossal Magnetoresistance Effect in Layered Perovskite La_(1.4)Sr_(1.6)Mn_2O_7

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