My favorite research topics are related to disorder phenomena in condensed matter in a rather wide sense and comprise fields such as highly frustrated magnetism, spin correlations and excitations, dynamic disorder effects in thermoelectric materials, ferromagnetism in semi-conducters and surface induced order and disorder phenomena.
Currently I am involved in various instrumentation projects and method developments for the Powder and Texture diffractometer POWTEX at FRM-2, the bi-spectral powder diffractometer within the ESS design and update programme, and the single crystal magnetism diffractometer and developments for polarization analysis.
In my role as an instrument scientist at the ESS, I coordinate the instrumentation for single crystal diffraction.
- Approaching the ground state of the kagome antiferromagnet Schweika, W.; Valldor, M.; Lemmens, P. Phys. Rev. Letters (2007) 98 067201 DOI: 10.1103/PhysRevLett.98.067201
- Dumbbell rattling in thermoelectric zinc antimony Schweika, W.; Hermann, R. P.; Prager, M.; et al., Phys. Rev. Letters (2007) 99 125501 DOI: 10.1103/PhysRevLett.99.125501
- Low-temperature ferromagnetism in (Ga, Mn)N: Ab initio calculations Sato, K; Schweika, W; Dederichs, PH; Katayama-Yoshida, H; Phys. Rev. B (2004) 70 201202 DOI: 10.1103/PhysRevB.70.201202
- XYZ-polarisation analysis of diffuse magnetic neutron scattering from single crystals Schweika, Werner, Journal of Physics Conference Series (2010) 211 012026 DOI: 10.1088/1742-6596/211/1/012026
- Faculty member of Physics and Lecturer, Aachen University, Germany 1998 - present
- Jülich Centre of Neutron Science-2, Scattering Methods 2007 - present
- Senior Scientist, Jülich Centre of Neutron Science-2, Peter-Grünberg Institut, the former Institute for Solid State Research, Forschungszentrum Jülich, Germany
- Instrument Scientist, DNS the diffuse neutron scattering instrument at Jülich and rebuilt at Munich, 1980-2007,
- Visiting Professor at University of Athens, Georgia, U.S.A. 1997
- Habilitation in experimental and theoretical physics at Aachen University 1997 Disordered Alloys, Diffuse Scattering and Monte Carlo Simulations
- Visiting Scientist at Lawrence Livermore National Laboratory, U.S.A. 1988
- Ph.D. Aachen University 1984 Diffuse neutron scattering and Monte Carlo study of short-range order and atomic interactions in Ni0.89Cr0.11, Institute for Solid State Research
- M.Sc./Dipl. in Physics 1980 Bochum University, Germany