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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 1534407398

Humboldt fellowship for Kathryn Arpino

August 16, 2018
The Alexander von Humboldt foundation has selected Kathryn Arpino for a Humboldt Research Fellowship for postdoctoral researchers. [more]
Teaser 1533036440

The marriage of topology and magnetism in a Weyl system

July 31, 2018
Topology is a global aspect of materials, leading to fundamental new properties for compounds with large relativistic effects. The incorporation of heavy elements give rise to non-trivial topological phases of matter, such as topological insulators, Dirac and Weyl semimetals. The semimetals are characterized by band-touching points with linear dispersion, similar to massless relativistic particles in high energy physics. [more]
Teaser 1532528767

ICM 2018 Best Poster Award Recipients

July 25, 2018
Congratulations to Dr. Eteri Svanidze, Dr. Andrea Amorese, and Maja Bachmann [more]
Teaser 1532522741

ECT2018 Poster Award

July 25, 2018
Congratulations to Felix Kaiser who received one of three “ECT2018 Poster Awards” during the recent “International and European Conference on Thermoelectrics” in Caen/France. [more]
Teaser 1531741332

The Quantum Sound of Metals

July 16, 2018
The Yearbook 2018 of the Max Planck Society is online. [more]
Teaser 1531735108

Tracking aluminum impurities in the heavy-fermion superconductor UBe13

July 16, 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. [more]
Teaser 1531317786

MnSiPt: Local magnetism rules the chemical bond

July 11, 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. [more]
Teaser 1530010475

Visualizing polaron formation in EuB6

June 26, 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. [more]
Teaser 1530789225

Team PLANCKTON at the 27th Dresden Dragon Boat Festival

June 26, 2018
On Saturday, 23 June 2018, the Dresden Dragonboat Festival occurred for the 27th time. More than 80 “dragon”-teams – among them our team PLANCKTON consisting of 19 members and guests of MPI CPfS – showed great strength, endurance and skill in compete for the highly coveted trophies. [more]
Teaser 1529930055

Structural complexity in Ca12[Mn19N23] und Ca133[Mn216N260]

June 25, 2018
The new Mn–rich alkaline earth nitridomanganates Ca12[Mn19N23] and Ca133[Mn216N260] represent the first examples of layered nitridomanganates and possess crystal structures with extended 2D networks of chemically bonded Mn atoms. They contain similar building blocks but of different levels of structural complexity. Furthermore, Ca133[Mn216N266] is the first representative of complex intermetallic structures with preferably covalent (two- and four-centre) bonding. [more]
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]
Teaser 1525421549

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]
Teaser 1524217270

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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