Dresden 2014 – scientific programme

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MA: Fachverband Magnetismus

MA 42: Magnetic Materials III

MA 42.1: Talk

Thursday, April 3, 2014, 15:00–15:15, HSZ 04

Stabilization of a structural pattern by local magnetic exchange in MnPtSi — Sarah Ackerbauer, •Andreas Leithe-Jasper, Walter Schnelle, Helge Rosner, and Yuri Grin — Max-Planck-Institut für Chemische Physik fester Stoffe, Nöthnitzer Straße 40, 01187 Dresden

Among the inorganic materials in general and intermetallic compounds in particular, the ternary phases with the stoichiometric ratio 1:1:1 belong to one of the largest families. The Pearson's Crystal Data - Crystal Structure Database for Inorganic Compounds counts several hundreds of the equiatomic phases. Despite a relatively simple component ratio more than 15 structure types have been found for the compounds of this group. This - on the first glance unexpected finding - is directly connected with the mechanisms of chemical bonding in intermetallic compounds. A possible scenarios may be described by two different energy scales: On the larger scale, an atomic arrangement is formed by combination of covalent and ionic interactions in accordance with the electronic needs of constituting elements. The final tuning of the structure is performed at a smaller scale and includes additional atomic interactions. In particular, paramagnetism of the components can be decisive for the achieving of the minimum of the total energy in the second step. The analysis of chemical bonding in MnPtSi reveals that the local magnetism of Mn rules its finally adopted structure.