Karel Prokes
Dr. Karel PROKEŠ, DrSc.
Field of interests:
Experimental Condensed Matter Physics and Materials Science:
Magnetism in d and f-electron systems
Techniques employed:
- Sample preparation: polycrystalline materials by arc-melting, single crystals by a modified Czochralski tri-arc method;
- Powder X-ray diffraction;
- Crystal and magnetic structure determination by Rietveld method;
- Orientation of single crystals by Laue method;
- Measurements of magnetic, thermal, transport and other related physical properties at low temperatures and their interpretation: specific heat in zero field and in magnetic fields, AC and DC magnetic susceptibility, electrical resistivity, magnetoresistance, Hall effect, ultrasonic measurements;
- High-magnetic fields: steady magnetic fields up to 20 T and pulse fields up to 60 T;
- Powder-neutron diffraction;
- Neutron-scattering experiments on single crystals under different environments: magnetic fields, hydrostatic pressure, low temperatures; polarized-neutron experiments, inelastic-neutron scattering experiments, use of group theory;
- Muon spin rotation spectroscopy;
Responsibilities at HZB:
- Instrument responsible: Double-axis diffractometer E4
- Experiments with the split-pair coil 14.5 T magnet VM-1 (implementation of the Dy booster providing a 2.5 T field enhancement)
Thesis:
M.S. thesis – "Distribution of magnetic flux in some high-temperature superconductors", Advisor - Dr J. Hrebik, Faculty of Mathematics and Physics, Charles University, Prague, CZ
Ph.D. thesis – "Magnetism in uranium intermetallic compounds", Advisors - Prof. Dr F.R. de Boer, Prof. Dr P.F. de Chatel and Prof. Dr V. Sechovsky, Van der Waals-Zeeman Institute, Faculty of Mathematics, Informatics, Physics and Astronomy, University of Amsterdam, The Netherlands