Berlin 2012 – scientific programme

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MA: Fachverband Magnetismus

MA 13: Magnetic Materials

MA 13.12: Talk

Monday, March 26, 2012, 18:00–18:15, H 0112

Low-temperature X-ray diffraction experiments on magnetocaloric La(Fe,Si)₁₃ - compounds — •Anja Waske¹, Lars Giebeler¹, Maria Krautz², Konstantin Skokov², and Oliver Gutfleisch² — ¹IFW Dresden, Institute of Complex Materials, P.O. Box 270116, D-01171 Dresden — ²IFW Dresden, Institute for Metallic Materials, P.O. Box 270116, D-01171 Dresden

Materials exhibiting the magnetocaloric effect could one day be the basis of a new magnetic cooling concept for consumer use, replacing conventional refrigeration technology. Since the magnetocaloric effect relies on a strong change of magnetization with temperature, usually these materials are employed close to a magnetic transition (e.g. FM to PM). Currently, most of the research in this field is dedicated to materials which undergo a structural transition that couples to the magnetic phase transition. In this way, large entropy changes and hence a large magnetocaloric effect can be achieved. However, very little is known about how the structural and the magnetic transition interact. Here, we report on low-temperature X-ray diffractometry experiments on magnetocaloric La(Fe,Si)₁₃ with varying Si content. By comparing the volume changes caused by the structural transition with the magnetocaloric properties, a close relation between structure and magnetism is revealed.