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Rosner, Helge
Helge Rosner
Group leader
Phone: +49 351 4646-2233
Fax: +49 351 4646-4902
Room: B1.2.33

Press releases

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Teaser 1526559182

Solving a new puzzle for the first heavy fermion superconductor

May 17, 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. [more]
Teaser 1525776162

Nicolas Kurti Science Prize: Congratulations to Dr. Philip Moll

May 08, 2018
Warm congratulations to Max Planck Research Group Leader Dr. Philip Moll, who has been awarded the 2018 Nicolas Kurti Science Prize for Europe.    [more]
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Second congratulations to Dr. Mark Barber

May 04, 2018
We are delighted to announce that Dr. Mark Barber, whose Otto Hahn Medaille we announced on 20 April 2018, has also won a Springer Thesis Award. [more]
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Otto Hahn Medaille: Congratulations to Dr. Mark Barber 

April 20, 2018
We are delighted to announce that Mark Barber from the Physics of Quantum Materials department has been awarded an Otto Hahn Medaille by the Max Planck Society for his doctoral thesis research. [more]
Teaser 1523276266

Ductile inorganic semiconductor at room temperature

April 09, 2018
Ductility is a characteristic feature of metals and metallic materials, but rarely observed for semiconductors and insulators. Scientists from the MPI CPfS and the Shanghai Institute of Ceramics of the Chinese Academy of Science report extraordinary metal-like ductility for the semiconductor a-Ag2S. A unified picture was obtained by combining different manufacturing and physical characterization techniques with quantum chemical analysis of chemical bonding. [more]
Teaser 1522938765

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

April 05, 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. [more]
Teaser 1522755530

Satya Narayan Guin receives a Humboldt Research Fellowship for Postdoctoral Researchers

April 03, 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. [more]
Teaser 1525783719

Leopoldina: Claudia Felser

March 23, 2018
Since the beginning of the year, Claudia Felser has been a member of the Leopoldina. [more]
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GDCh: Claudia Felser

February 16, 2018
Structural changes have occurred with the new year in the „Gesellschaft Deutscher Chemiker“, the society for German Chemists: Professor Felser is now the new head of the research group for solid-state chemistry and material research.  [more]
Teaser 1516605880

Charge Order and Electron Localization in a Molecule-Based Solid 

January 20, 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. [more]
Teaser 1516357112

Be21Pt5: a superconducting complex electron-poor intermetallic phase

January 19, 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. [more]
Teaser 1515485106

Ground state wave function of the strongly correlated topological insulator SmB6

January 08, 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. [more]
Teaser 1515419323

LaNiO3: a highly metallic strongly correlated oxide with antiferromagnetic correlations

January 08, 2018
The rare earth nickelates RNiO3 with the high Ni3+ oxidation state have continued to attract enormous interest due to the famous metal-insulator transition and unusual charge and spin-order phenomena together with the prediction for multi-ferroicity and even superconductivity in thin film hetero-structures. One of the long standing puzzles is why LaNiO3 seems to be the only RNiO3 that stays metallic and paramagnetic down to lowest temperatures. Recently, the team around Alexander Komarek was able to grow centimeter-sized and impurity-free single crystals of LaNiO3 and then to unveil its true electrical and magnetic properties. The result is that the phase diagram of the RNiO3 system has to be redrawn and that theoretical concepts have to be reconsidered about how to explain the properties and the electronic structure of these high oxidation state materials. [more]
Teaser 1512391602

Pressure-induced Ferromagnetism in FeTe

December 04, 2017
The high-temperature superconductivity in iron-pnictides and –chalcogenides is based on the intricate interplay of crystal structure, electronic and magnetic states. The concerted study by scientists from different departments of the Max Planck Institute for Chemical Physics of Solids and from the Leibniz Institute for Solid State and Materials Research found for iron-telluride the remarkable result that hydrostatic pressure leads to the emergence of ferromagnetic order in a peculiar way. [more]
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Ultraclean metal-like conductivity in semimetallic WP2

November 27, 2017
Ultraclean metals show high conductivity with a high number of charge carriers, whereas semiconductors and semimetals with low charge carriers normally show a low conductivity. This scenario in semimetals can be changed if one can protect the carriers from scattering.  [more]
Teaser 1511528195

The Iron Age: about the understanding of the new iron-based high-temperature superconductors and related compounds

November 24, 2017
In the new iron-based superconductors (FeSC), superconductivity occurs close to an antiferromagnetic phase. This indicates that correlation effects may be important in these materials. Theoretical calculations predict that different from cuprates, besides the on-site Coulomb interaction also the on-site Hund exchange interaction plays an important role in the correlation effects of FeSCs. This would mean that a completely new state of correlated matter has appeared which has been termed “Hund’s metal”. [more]
Teaser 1510315424

Thermodynamic signatures of field-induced phase transitions in graphite

November 10, 2017
Graphite is a model system for the study of electrons in the so-called magnetic quantum limit. This quantum limit is attained when the magnetic field is strong enough to confine the charge carriers to their lowest Landau levels. It is expected that the model of the free electron gas fails beyond this limit since here electron interactions may play a significant role in determining the electronic ground state. Indeed, our thermodynamic studies in high magnetic field revealed that even electron-lattice interaction has to be taken into account in addition to electron-electron interaction.    [more]
Teaser 1510308474

New features in multipolar heavy-fermion materials

November 10, 2017
The simple cubic structure of CeB6 does not change while intricate multipolar phenomena are developed upon a non-magnetic La substitution. However, phase diagrams of Ce1-xLaxB6 have been elusive for the last decades. Recently, detailed phase transitions in Ce1-xLaxB6 have been revealed by scientists of MPI-CPfS, TU-Dresden, and I. M. Frantsevich Institute. In addition, a simple feature which is likely to be observed in a multipolar heavy-fermion system has been found.  [more]
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