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Rosner, Helge
Helge Rosner
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Phone: +49 351 4646-2233
Fax: +49 351 4646-4902

Press releases

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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]
Teaser 1511777954

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]
Teaser 1509706517

Robust Bain distortion in the premartensite phase of a platinum-substituted Ni2MnGa magnetic shape memory alloy

October 23, 2017
The premartensite phase of shape memory and magnetic shape memory alloys is believed to be a precursor state of the martensite phase with preserved austenite phase symmetry. The thermodynamic stability of the premartensite phase and its relation to the martensitic phase is still an unresolved issue, even though it is critical to the understanding of the functional properties of magnetic shape memory alloys. [more]
Teaser 1508741912

Dr. Steffen Wirth zum Fellow der American Physical Society (APS) gewählt

October 20, 2017
Steffen Wirth erhält die Fellowship für „seine grundlegenden Beiträge zu unserem Verständnis von stark korrelierten Elektronensystemen, insbesondere bei reduzierten Längenskalen, einschließlich des Kondo-Effekts und magnetischer Wechselwirkungen", wie es in der Ernennungsurkunde heißt.  [more]
Teaser 1506601088

Electrons with different spin maximally split 

September 28, 2017
The surfaces of materials can host unique electronic properties, where the electrons behave very differently from the interior. In particular, the intrinsically broken symmetries of the surface compared with the bulk of the sample allows for a separation of energy states according to their spin. This effect could be utilised in novel electronic devices which operate with both the charge and spin of electrons- but it is first necessary to understand how to maximise the magnitude of the effect. [more]
Teaser 1505894769

Quantum Tricritical Points

September 20, 2017
The concept of 'quantum critical point', the zero temperature point of a line of 2nd order phase transitions, is rather modern: It is nowadays strongly investigated mainly in connection with unconventional superconductivity. Recent experimental and theoretical works have shown that some metals show competing ferro- and antiferromagnetic order at very low temperature. This allows for the possibility of multiple critical points and thus, at T=0, for quantum tricritical points. [more]
Teaser 1505136935

New insights into heat conduction in solids

September 11, 2017
Phonons passing a thermal insulator generally have a short life time. The investigation of the clathrate I phase Ba7.81Au5.33Ge40.67 shows now a completely different picture. [more]
Teaser 1504266989

Bit data goes anti-skyrmions

September 01, 2017
Today’s world, rapidly changing because of “big data”, is encapsulated in trillions of tiny magnetic objects – magnetic bits – each of which stores one bit of data in magnetic disk drives.   A group of scientists from the Max Planck Institutes in Halle and Dresden have discovered a new kind of magnetic nano-object in a novel material that could serve as a magnetic bit with cloaking properties to make a magnetic disk drive with no moving parts – a Racetrack Memory – a reality in the near future. [more]
Teaser 1504260015

Dr. Enke Liu honored with National Science Fund for Excellent Young Scholars

September 01, 2017
The National Natural Science Foundation of China honors Dr. Enke Liu, a Humboldt research fellow of the Alexander von Humboldt Foundation, with the 2017 National Science Fund for Excellent Young Scholars for his great contribution to magnetic phase transitions. This scholarship serves as a substantial bolster to the young talents in China. [more]
Teaser 1503402928

Electrons choose a direction

August 22, 2017
The group “Micro Structured Quantum Matters” at MPI-CPfS develops microscopic electric conducting paths made of quantum materials to understand their physical properties and to test possible applications in new types of electronics. In cooperation with US scientists, they succeeded in showing a rare state in microchips in which electrons move together. That state is called “electronic nematicity”. It occurs in high magnetic fields in a layered metal made of cerium, rhodium and indium, called CeRhIn5. In an article published in the journal “Nature”, the scientists point to a new approach of understanding the link between electronic nematicity and superconductivity. Electrons move together in the superconductivity as well and links between the two phenomena were assumed for a long time. [more]
Teaser 1500557051

Topological Quantum Chemistry

July 20, 2017
Researchers find path to discovering new topological materials, holding promise for technological applications. [more]
Teaser 1500533731

IBM Scientists Observe Elusive Gravitational Effect in Solid-State Physics

July 19, 2017
Previously thought to only occur in the early stages of the universe and within neutron stars and black holes [more]
Teaser 1498568020

Composition of clathrates: Computational structure analysis

June 27, 2017
In a collaboration between the Fritz Haber Institute in Berlin and the department Chemical Metals Science at MPI CPfS, defect concentrations in clathrate networks and the existence of high temperature phases have been predicted theoretically. [more]
Teaser 1498117063

PETMEM Meeting

June 22, 2017
The PETMEM consortium met at MPI-CPfS Dresden on the 15th and 16th of June 2017 for the Month-18 consortium meeting. [more]
Teaser 1493104538

International Prize for Clifford Hicks

April 25, 2017
Clifford Hicks from the Physics of Quantum Materials department has won the International Young Scientist Prize in Low Temperature Physics from the International Union of Pure and Applied Physics. [more]
Teaser 1491925135

Prof. Claudia Felser receives her second ERC Advanced Grant

April 11, 2017
With this prestigious grant of the European Research Council, Claudia Felser and her team will study single crystals of topological materials and their physical properties. She will receive more than two million Euros over a period of five years. Using this grant, they plan to engineer this new class of quantum materials via the synthesis of high quality single crystals and tune their topological phase transitions, transport properties and surface states by the application of electric and magnetic fields and high pressure. To further boost topological science in Europe, a single crystal platform will be established within the project. The institute sincerely congratulates Claudia Felser on this success! [more]
 
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