Effect of a magnetic field on magnetic entropy change in LaFe_11.7Si_1.3 compound

张炜^1,2，李波^2,3，千正男²，张静云⁴，张宏伟⁵，苏文辉²

1. School of Materials Science and Engineering,Hebei University of Technology2. Center for the Condensed Matter Science and Technology,Department of Physics,Harbin Institute of Technology3. Department of Xuzhou Electromechanical Engineering,Jiangsu Union Technical Institute4. Division of Physics and Applied Physics,School of Physical and Mathematical Sciences,Nanyang Technological University5. State Key Laboratory of Magnetism,Institute of Physics and Center for Condensed Matter Physics,Chinese Academy of Sciences

摘 要：The magnetocaloric effect of LaFe11.7Si1.3 compound was investigated under an external magnetic field up to 9 T.The magnetization changed drastically at the Curie temperature TC under different fields and TC increased with the applied fields.The magnetic entropy change |?SM| vs temperature peak consisted of a spike and a plateau.The spike was a spurious result,while the plateau part resulted from the field-induced itinerant-electron metamagnetic（IEM） transition above TC,which went up with magnetic fields increasing.The width of the magnetic entropy change increased with magnetic fields at a rate of dL?S /dT⁴ K/T.

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