Regensburg 2019 – scientific programme
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MA: Fachverband Magnetismus
MA 35: Caloric effects in ferromagnetic materials
MA 35.3: Talk
Wednesday, April 3, 2019, 15:30–15:45, H52
Local structural analysis of La(Fe,Si)13-compounds — •Cynthia Pillich1, Alexandra Terwey1, Katharina Ollefs1, Benedikt Eggert1, Daniela Trienes1, Markus E. Gruner1, Werner Keune1, Valentin Brabänder2, Iliya Radulov2, Konstantin Skokov2, Oliver Gutfleisch2, Mauro Rovezzi3,4, and Heiko Wende1 — 1Faculty of Physics and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, 47057 Duisburg, Germany — 2Materials Science, Technical University Darmstadt, 64287 Darmstadt, Germany — 3Observatoire des Sciences de l’Univers de Grenoble (OSUG), UMS 832 CNRS, Univ. Grenoble Alpes, F-38041 Grenoble, France — 43BM30B/CRG-FAME, ESRF, Polygone Scientifique Louis Nèel, 71 avenue des Martyrs, 38000 Grenoble, France
La(Fe,Si)13-compounds show excellent magnetocaloric properties due to an isostructural volume decrease upon increasing temperature, accompanying a first-order magnetostructural transition, and therefore is used in solid state refrigeration. By analyzing the Extended X-Ray Absorption Fine Structure (EXAFS) at the Fe K- and La L3-edge we can observe the influence of Mn-doping on the local surrounding of the atoms in La(Fe,Si)13. The measurements were performed for different Mn-concentrations in the 1:13 system as well as varying temperatures. A lattice contraction at the phase transition from the FM to the PM state was observed. Comparing the experimental data with a theoretically modeled EXAFS signal gives insight into the local lattice configuration. Funding by the DFG (SPP1599) is acknowledged.