Berlin 2018 – scientific programme
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MA: Fachverband Magnetismus
MA 52: Poster II
MA 52.33: Poster
Thursday, March 15, 2018, 15:00–18:00, Poster C
Effect of high Mn-doping on magnetocaloric La(FeSi)13-based compounds — •Alexandra Terwey1, Benedikt Eggert1, Daniela Trienes1, Joachim Landers1, Soma Salamon1, Werner Keune1, Katharina Ollefs1, Iliya Radulov2, Konstantin Skokov2, Oliver Gutfleisch2, and Heiko Wende1 — 1Faculty of Physics and Center for Nanointegration (CENIDE), University of Duisburg-Essen, Duisburg, Germany — 2Functional Materials, TU Darmstadt, Darmstadt, Germany
By combining low temperature Mössbauer studies with and without applied magnetic fields and magnetometry, we investigated the effect of Mn-doping with increasing concentrations on La(FeSi)13-based compounds and thereby analyzed the coupling of Mn to the Fe sublattices in the system. La(FeSi)13-based materials have the potential use as magnetocaloric refrigerants due to a first-order magneto-structural phase transition near room temperature when additionally doped with hydrogen. Mn doping prevents hydrogen segregation. From our Mössbauer studies at low temperatures in applied external magnetic fields we find a decrease in the hyperfine fields with increasing Mn concentration as well as an increase in the spin frustration. This increase in spin frustration points towards a stronger AFM coupling between Fe and Mn and additionally results in a lowering of the saturation magnetization and of the local Fe moment as validated by magnetometry and extracted hyperfine magnetic fields. Funding by the DFG (SPP1599) is acknowledged.