Verbindungen im MgAgAs-Strukturtyp (Halb-Heusler Phasen) stellen eine wichtige Substanzklasse in den modernen Materialwissenschaften dar. Die Kenntnis aller möglichen Elementkombinationen ist hierbei von elementarer Bedeutung. Mittels einer wissensbasierten Erweiterung des reinen Hoch-Durchsatz Computerchemie-Verfahrens wurden auf der Basis eines speziell entwickelten chemischen Bindungsmodells bislang unentdeckte Phasen im MgAgAs-Typ vorhergesagt und nachfolgend experimentell verifiziert.
Fe3O4 (magnetite) is one of the most elusive quantum materials as well as one of the most studied transition metal oxide for thin film applications. Yet, despite the tremendous amount of work devoted to preparing magnetite thin films, the enigmatic Verwey transition is in thin films extremely broad and occurs at substantially lower temperatures than that in bulk crystals. Recently, scientists at MPI CPfS have succeeded in growing magnetite thin films which not only have the Verwey transition as sharp as in the bulk, but also show transition temperatures that are substantially higher than the bulk.
SmB6 is predicted to be a candidate material for a topological Kondo insulator. By utilizing scanning tunneling spectroscopy (STS) down to 0.35 K with energy resolution of ~0.5 meV, we determined the electronic fine structure on large, non-reconstructed surfaces. Impurity, magnetic-field and temperature dependent STS spectra revealed bulk and/or surface contributions to the electronic states, and unveiled a new energy scale of >7 K related to a suppressed Kondo effect at the surface of SmB6.
URu2Si2 undergoes a mysterious ordering transition at 17 K which challenges theoretical and experimental physicists since more than thirty years. By now is generally understood that the distribution of the uranium electron density plays a key role, however, measuring these has so far not been possible. Recently, scientists from MPI-CPfS, University of Cologne and Van-der-Waals-Zeeman Institute in Amsterdam were able to measure these charge distributions by means of inelastic x-ray scattering.
The solid state chemistry (SSC) department of MPI-CPfS takes part in the speedCIGS project which its main aims is to speed up the manufacturing process of solar cells based on Cu(In,Ga)Se2 (CIGS). The project is funded by Federal Ministry for Economic Affairs and Energy. MPI-CPfS collaborates in this project by performing computer simulation to support the experimental findings of other partners from industry and research institutes.[mehr]