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Young Investigators Group Prof. Raphaël Hermann

Lattice Dynamics in Emerging Functional Materials

(in cooperation with the University of Liège)

The Young Investigators Group "Lattice Dynamics in Emerging Functional Materials" was established in July 2008; its funding will come to an end on 30.06.2014.

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Our research interests lie in the study of the lattice dynamics in thermoelectric materials, in bulk and nanostructured forms, in charge order materials and in phase change materials, and in the relationship between lattice dynamics and functionality.

Scattering techniques such as inelastic neutron, inelastic x-ray, or inelastic nuclear resonance scattering are utilized in order to study the lattice dynamics through the phonon density of states or dispersion. Complementary information is obtained by specific heat, Moessbauer spectral, and thermal transport measurements. A resonant ultrasound spectrometer is used for measurements of the elastic constants as a function of temperature and applied magnetic field.

Main Research Focus

In addition to engaging in various collaborations with universities and research centres, we are also part of a major research project on nanostructured thermoelectric materials.  Within the scope of this programme, our interests are concentrated in particular within the areas of “Nanostructure, excitation and thermoelectric properties of nanostructured Bi2Te3”, “Silicon and germanium nanocomposites for themoelectric applications” and “Thermoelectric properties of binary and quasi-ternary intermetallic phases”.  We are supported in our research work by groups from the University of Tübingen, University of Hamburg, the Frauenhofer Institutes in Freiburg and Dresden, the University of Duisburg-Essen, the Technische Universität München (TUM), and the Johannes Gutenberg University Mainz.

The Young Investigator's Research Group "Lattice Dynamics in Emerging Functional Materials" was established in July 2008; its funding will come to an end on 30.06.2014.

It is located at the Jülich Centre for Neutron Science at Forschungszentrum Jülich, where it is part of the institute for Scattering Methods.

Group members:

Head of Young Investigators Group

Dr. Raphaël Hermann, Prof.

Group Leader
Invited Professor, Faculty of Sciences, University of Liège, Belgium

E-Mail: r.hermann@fz-juelich.de
Tel.: +49 2461 61-4786
Fax: +49 2461 61-2610

Scientists

Dr. Benedikt Klobes

Scientist
Thermoelectrics, Mössbauer spectroscopy, nuclear resonance scattering

Email: b.klobes@fz-juelich.de
Tel.: +49 2461 61-3593
Fax: +49 2461 61-2610

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Dr. Abdelfattah Mahmoud

Scientist
Electrochemically active materials characterization by nuclear resonance and neutron scattering techniques

E-Mail: a.mahmoud@fz-juelich.de

Tel.: +49 2461 61-1942
Fax: +49 2461 61-2610

Dr. Vasily Potapkin

Scientist
Magnetism in nickel compounds under high pressure

Email: v.potapkin@fz-juelich.de
Tel.: +49 2461 61-6672
Fax: +49 2461 61-2610

Students

DI Pavel Alexeev

Ph.D. student
Development of a backscattering monochromator and sapphire ultraoptics for 183W phonon spectroscopy

Email: p.alexeev@fz-juelich.de
Tel.: +49 2461 61-9329
Fax: +49 2461 61-2610

DP Marcus Herlitschke

Ph.D. student
Lattice dynamics and charge states in functional iron oxides.
Email: m.herlitschke@fz-juelich.de
Tel.: +49 2461 61-1490
Fax: +49 2461 61-2610

M.Sc. Atefeh Jafari

Ph.D. Student
Sapphire ultraoptics for sub-meV 121Sb and 125Te phonon spectroscopy

Email: a.jafari@fz-juelich.de
Tel.: +49 2461 61-1490
Fax: +49 2461 61-2610

Mebonia M

Mikheil Mebonia

Ph.D. Student

Transport properties in nanostructured thermoelectrics

E-Mail: m.mebonia@fz-juelich.de
Tel.: +49 2461 61-2473
Fax: +49 2461 61-2610

Ronnie Simon

Ph.D. student
Lattice dynamics in antimony & tellurium based phase change materials

Email: r.simon@fz-juelich.de
Tel.: +49 2461 61-4037
Fax: +49 2461 61-2610


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