Profile:
The research group has a more than 25 years tradition in preparation and analysis of superconducting films and multilayers and their application for cryoelectronic devices like Josephson junctions and DC-SQUIDs. Starting from conventional superconductors Nb and Pb (LTSC) within the last years especially the possibilities of high temperature superconductors (HTSC) like YBCO and BSCCO were studied. The corresponding low temperature technique for the region 7 mK to 85 K is at present completed by own cryocooler development.
Topics in physics:
- Properties of epitaxial HTSC films and multilayers with different insulating, semiconducting or normal conducting intermediate and buffer layers on
different substrates
- Investigation of surface and transport properties of these films
- Josephson effects, proximity effect and tunneling phenomena in superconducting devices (experiment and theory)
- DC-SQUIDs and their application e.g. in measurement technique and medicine
- Investigation of magnetic nanoparticles
- Investigation of Carbon Nanotubes
- Subproject C4 of SFB / TR 7 "Gravitational Wave Astronomy":
Cryogenic Q-factor measurements of interferometer components
Topics in experimental technique:
- Laser deposition and dc sputtering of HTSC films
- Patterning by photo lithography and ion beam etching
- Electrical characterization of cryoelectronic devices (dc resistance, microwave irradiation, magnetic field dependence up to 5 T)
- Development and realization of disturbance decoupled and disturbance reduced cryocoolers like pulse tube refrigerator for cooling of highly sensitive devices
- Application of highly sensitive LTSC SQUIDs with a resolution 2fT/Hz as pico-voltmeter, beam current cryo comperator, MCG/MEC in cooperation with the biomagnetic center
- Development of HTSC SQUIDs for application e.g. non-destructive evaluation and biomagnetism
Educational activities:
- Solid state physics
- Experimental and applied physics
- Practical training in electronics, basic and higher physics
- Diplom and PhD students
- High temperature superconductivity
- Josephson effects
- Fundamentals and application of superconductivity
- Low temperature physics and technique
- Point contact and tunneling spectroscopy
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