News from the Physics of Correlated Matter Department

Control of Bistable Antiferromagnetic States for Spintronics

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. more

CaCu<sub>3</sub>Ru<sub>4</sub>O<sub>12</sub>: A High-Kondo-Temperature Transition-Metal Oxide

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.

<p><strong>Selective Orbital Imaging of Excited States with X-Ray Spectroscopy: The Example of α-MnS</strong></p>

A team lead by scientists from the MPI CPfS developed a novel experimental method that provides direct images of excited states in a transition metal compound without the need for complex calculations. This constitutes a major step for the understanding of the electronic structure and the rich physics of these materials.   more

Duality of 5<em>f</em> electrons in U<em>M</em><sub>2</sub>Si<sub>2</sub>

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. more

<a href="internallink:3158223">Donut-shaped orbitals and Ising magnetism in Ca<sub>3</sub>Co<sub>2</sub>O<sub>6</sub></a>

The research teams of Hao Tjeng from the MPI-CPfS, Andrea Severing from the University of Cologne, Antoine Maignan from CRISMAT Laboratory Caen, and Maurits Haverkort from the University of Heidelberg have succeeded in determining the electronic orbital that is responsible for the Ising magnetism in Ca3Co2O6. A direct image of the donut-shaped orbital has been made using the new Max Planck end-station at German Electron Synchrotron DESY in Hamburg. more

OTF 2019 Poster Award Winner

Dr. Chi-Nan Wu was awarded the best poster prize at the 4th Functional Oxide Thin Films for Advanced Energy and Information Technology Conference held in Lisbon, Portugal. more

IXS 2019 Poster Session Award Winner

Dr. Brett Leedahl was awarded with the Poster Session Award at the 11th International Conference on Inelastic X-ray Scattering (IXS 2019) held at Stony Brook, USA, in 24-28 June 2019. more

<p>Inauguration of the new MPI-NSRRC beamline in Taiwan</p>

The newly constructed MPI-NSRRC TPS 45A beamline has been inaugurated on 7-May-2019 in the presence of the German Ambassador in Taiwan and the Deputy Minister of the Taiwan Ministry of Science and Technology. more

<p>New method for imaging electronic orbitals in solids</p>

A collaboration of the Max-Planck Institute for Chemical Physics of Solids, the University of Heidelberg, and the University of Cologne has developed a new method for imaging electronic orbitals in solids at the German Electron Synchrotron DESY in Hamburg.  more

<span>Revealing the topological nature of the surface states in SmB</span><sub>6</sub>

The topological nature of the surface states in SmB6 is exposed by means of scanning tunneling spectroscopy on samples with magnetic substituents or by using magnetic tunneling tips. These local measurements are complemented by global transport measurements on identical samples. more

<span>A universal strategy to design superior water splitting electrocatalysts with </span><em>in situ</em><span> fast surface reconstruction</span>

A universal strategy based on electrochemically induced fast reconstruction of amorphous nanofilm precursors is proposed for exploring ultrahigh mass activity and extremely stable bifunctional water splitting catalysts. The facile reconstruction strategy is promising for the development of novel efficient catalysts for other advanced energy conversion and storage devices. more

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