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Rosner, Helge
Helge Rosner
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Telefon: +49 351 4646-2233
Fax: +49 351 4646-4902
Raum: B1.2.33

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Teaser 1531743332

Elektronische Quantenmusik

16. Juli 2018
Der Beitrag unseres Institut zum Jahrbuch 2018 der MPG ist online. [mehr]

Tracking aluminum impurities in the heavy-fermion superconductor UBe13

16. Juli 2018
The mechanism behind the observed sample dependency in the heavy-fermion superconductor UBe13 was attributed to the presence of Al impurities in single-crystals. Various diffraction and spectroscopy techniques as well as transmission electron microscopy revealed the location of Al in the structure and its influence on the superconducting properties. Upon long-term annealing, Al atoms can leave the crystal and restore the properties of Al-free UBe13. [mehr]
Teaser 1531317817

MnSiPt: Local magnetism rules the chemical bond

11. Juli 2018
A thorough experimental characterization with a theoretical analysis of the chemical bonding of the intermetallic compound MnSiPt leads to surprising results:  the formation of direct Mn–Mn bonds is suppressed because the energy gain due to bond formation is significantly smaller than the on-site magnetic interactions. Therefore, after formation of the covalent bonds between Pt and Si as well as between Mn and Si, the strong Mn intra-atomic exchange is the key factor for the stability of the crystal structure. In competition against the Mn–Mn bond formation, intra-atomic magnetic interactions determine the topology of the local atomic arrangement in the finally adopted TiNiSi-type crystal structure in MnSiPt. [mehr]
Teaser 1530010457

Visualizing polaron formation in EuB6

26. Juni 2018
A combination of scanning tunneling microscopy and locally resolved magnetic stray field measurements unambiguously revealed the polaron formation in the ferromagnetic semimetal EuB6. These polarons are at the heart of the colossal magnetoresistive effects near the ferromagnetic transition in this material. [mehr]
Teaser 1530789143

Team PLANCKTON beim 27. Dresdner Drachenboot-Festival

26. Juni 2018
Am Samstag, den 23. Juni 2018, jährte sich das Dresdner Drachenboot-Festival zum 27. Mal. Über 80 „Drachen“-Teams - darunter auch unser Team PLANCKTON aus 19 Mitarbeiter*innen des MPI CPfS und Gästen - zeigten Ausdauer und Stärke, um einen der begehrten Pokale zu erpaddeln. [mehr]
Teaser 1529929724

Strukturelle Komplexität in Ca12[Mn19N23] und Ca133[Mn216N260]

25. Juni 2018
Die neuen Mn–reichen Erdalkali-Nitridomanganate Ca12[Mn19N23] und Ca133[Mn216N260] repräsentieren die ersten Beispiele schichtartiger Nitridomanganate und besitzen Kristallstrukturen mit ausgedehnten zweidimensionalen Netzwerken chemisch gebundener Manganatome. Sie enthalten ähnliche Baueinheiten, jedoch mit unterschiedlichen Graden struktureller Komplexität. Darüber hinaus ist Ca133[Mn216N266] der erste Repräsentant komplexer intermetallischer Strukturen mit vorzugsweise kovalenter Zwei- und Vierzentrenbindung.  [mehr]
Teaser 1526559067

Solving a new puzzle for the first heavy fermion superconductor

17. Mai 2018
The first heavy-fermion superconductor CeCu2Si2 was thought to have d-wave gap with node, until recent new measurements evident a fully opened gap. Recently, scientists from MPI-CPfS, Zhejiang University, Rice University and the University of Augsburg found a resolution to this puzzle based on measurements of the London penetration depth, which reconcile the d-wave pairing symmetry and nodeless gap structure. [mehr]
Teaser 1525776239

Nicolas-Kurti-Wissenschaftspreis: Herzliche Glückwünsche an Dr. Philip Moll

8. Mai 2018
Herzliche Gratulation an den Max-Planck-Forschergruppenleiter Dr. Philip Moll, der den Nicolas-Kurti-Wissenschaftspreis für Europa in diesem Jahr erhalten hat!   [mehr]
Teaser 1525421543

Ein zweiter Glückwunsch an Dr. Mark Barber

4. Mai 2018
Wir freuen uns, dass Dr. Mark Barber, dessen Otto Hahn Medaille wir am 20. April 2018 bekannt gegeben haben, auch einen "Springer Thesis Award gewonnen" hat. [mehr]
Teaser 1524217277

Otto-Hahn-Medaille: Herzliche Glückwünsche an Dr. Mark Barber

20. April 2018
Wir gratulieren Mark Barber von der Abteilung "Physik der Quantenmaterie", der für seine Doktorarbeit die Otto-Hahn-Medaille der Max-Planck-Gesellschaft erhalten hat. [mehr]
Teaser 1523277942

Ein duktiler anorganischer Halbleiter bei Raumtemperatur

9. April 2018
Duktilität ist eine charakteristische Eigenschaft von Metallen und metallischen Materialien, wird aber selten bei Halbleitern und Isolatoren beobachtet. Wissenschaftler des MPI CPfS und des Shanghai Institute of Ceramics der Chinesischen Akademie der Wissenschaften berichten hohe metallartige Duktilität des Halbleiters a-Ag2S. Ein einheitliches Bild wurde durch Kombination verschiedener Präparations- und Charakterisierungs-Techniken mit quantenchemischer Analyse der chemischen Bindung erhalten. [mehr]
Teaser 1522938715

c-axis dimer and its electronic breakup: The insulator-to-metal transition in Ti2O3

5. April 2018
New X-ray spectra of the electronic structure of the transition metal oxide Ti2O3 reveal unprecedented electronic molecular detail about the transition from insulator to metal as temperature increases. [mehr]
Teaser 1522939065

Satya Narayan Guin receives a Humboldt Research Fellowship for Postdoctoral Researchers

3. April 2018
The Alexander von Humboldt foundation, Germany, awarded Satya a Humboldt Research Fellowship for postdoctoral researchers. He is currently working as a postdoc with Prof. Claudia Felser. [mehr]
Teaser 1525783686

Leopoldina: Claudia Felser

23. März 2018
Zu Beginn dieses Jahres wurde Claudia Felser in die Leopoldina aufgenommen. [mehr]
Teaser 1520425779

GDCh: Claudia Felser

16. Februar 2018
In der Gesellschaft Deutscher Chemiker gibt es strukturelle Neuerungen: Seit Beginn des Jahres steht der Forschungsgruppe Festkörperchemie und Materialforschung Professor Felser vor. [mehr]
Teaser 1516367701

Charge Order and Electron Localization in a Molecule-Based Solid 

20. Januar 2018
Charge ordering in cationic mixed-valence compounds is of crucial importance for materials science. The prototypic example for a transition from a charge-disordered  to a charge-ordered state has been magnetite, Fe3O4, where Evert Verwey  observed a sudden jump in resistivity near -150°C. In the journal Science Advances now a research team of scientists from Germany and Slovenia reports a Verwey-type charge-ordering transition in a different class of mixed-valence compounds which is composed of negatively charged dioxygen molecules. [mehr]
Teaser 1516357120

Be21Pt5: eine supraleitende komplexe intermetallische Elektronenmangelverbindung

19. Januar 2018
The crystal structure and chemical bonding scenario of the complex intermetallic compound Be21Pt5 was solved in a joint collaboration spearheaded by scientists from the Max-Planck Institute for Chemical Physics of Solids. Be21Pt5 shows the rare case of superconductivity in a complex intermetallic compound with over 400 atoms per unit cell. Real space analysis of the calculated electron density and the electron localizability indicator (ELI) reveal structural units with collective intra-cluster interactions, termed cluster bonding, which are linked in the structure by strongly polar three-center interactions. [mehr]
Teaser 1515485098

Ground state wave function of the strongly correlated topological insulator SmB6

8. Januar 2018
SmB6 is under focus because it may be the first topological insulator that is also strongly correlated. It is intermediate valent and a gap opens only at low temperatures due to an intricate interplay between correlation effects and hybridization, yet the surface is always conducting. The topological properties of the surface are determined by the bulk so that it is surprising that the bulk crystal-field ground state of Sm3+ was unknown until now despite many attempts by e.g. neutron scattering. Recently, scientists from the Max-Planck Institute for Chemical Physics of Solids and the University of Cologne clarified this issue by applying a new technique, namely core-level non-resonant inelastic x-ray scattering, see Sundermann et al., Phys. Rev. Letter 120, 016402 (2018). The finding that the ground state is the Γ8 quartet and not the Γ7 doublet, contradicts all existing band structure calculations and illustrates in a sobering manner the difficulties in making reliable predictions for the properties of correlated systems. [mehr]
 
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