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Two bistable and reversibly controllable antiferromagnetic states in strained BiFeO₃ (BFO) films are discovered. These two non-volatile antiferromagnetic states are successfully patterned with a non-contact approach combining both optical and magnetic methods. The written antiferromagnetic pattern is electrically readable with at least 30% signal difference. This work promises an efficient route toward practical applications of antiferromagnetic spintronics. mehr

The Kondo effect, a hallmark of the physics of correlated electrons, is extremely rarely observed in transition metal oxides.  Over half a century after its discovery, the study of the Kondo physics and related phenomena is largely limited to rare-earth compounds. Here, an international team led by scientists from the MPI CPfS, the Osaka Prefecture University, and the TU Wien demonstrate that Kondo physics is realized in CaCu₃Ru₄O₁₂, a transition metal oxide with a perovskite structure.
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Ein Team unter der Leitung von Wissenschaftlern des MPI CPfS hat eine neuartige experimentelle Methode entwickelt, die direkte Bilder von angeregten Zuständen in einer Übergangsmetallverbindung liefert, ohne dass komplexe Rechnungen erforderlich sind. Dies ist ein wichtiger Schritt für das Verständnis der elektronischen Struktur und der vielfältigen Physik dieser Materialien. mehr

The intricate interplay of band-formation and electron correlation effects in uranium heavy fermion compounds is subject of an ongoing debate. Here scientists from MPI CPfS in Dresden, University of Cologne, University of Erlangen, Heidelberg University, University of California at San Diego, Los Alamos National Laboratory, Institute of Low Temperature & Structure Research in Wroclaw, Van-der-Waals-Zeeman Institute in Amsterdam, and the German Synchrotron in Hamburg (PETRA-III/DESY) gained new and unexpected insight from advanced spectroscopies on isostructural members of the UM₂Si₂ family with different properties. mehr

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