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Electron spin resonance spectroscopy in strongly correlated materials

Final Activity Report Summary - ESRISCOM (Electron spin resonance spectroscopy in strongly correlated materials)

We studied the electronic properties of strongly correlated electron systems and completed the major project objectives which were outlined in the proposal. Strong correlation effects were in the focus of intensive studies during the last half century. Materials exhibiting such phenomena include superconductors, Mott-Hubbard insulators with magnetically ordered ground states, materials with density wave ground states and materials with more exotic and not yet fully understood states such as the Tomonaga-Luttinger liquid state. Materials with strong correlations, such as superconductors, can be found in applications in space research, electronics, military applications and medicine.

The project focused on three objectives:
1. development of a multifrequency, high-field electron spin resonance spectrometer with improved sensitivity;
2. study of the properties of single wall carbon nanotubes (SWCNTs) encapsulating molecular structures;
3. study of the properties of novel superconductors.

The first objective was completed by the purchase of the necessary elements and the assembly of the spectrometer. The second goal was successfully completed by the synthesis and electron spin resonance (ESR) studies of magnetic fullerenes inside single-wall carbon nanotubes. We published the result in 'Physical Review Letters', the leading international scientific journal of the physics field. The third objective was completed by the spectroscopic study of superconductors and their mother compounds.

Since the host was situated in a less favoured region of the Community, the completion of the first objective also contributed to the cohesion of Hungary. The latter two project goals concerned cutting edge science; therefore the success in their completion contributed to the strengthening of the European research area.

As an indicator of the project success we published 13 journal papers, 1 book chapter and presented the work at 2 scientific conferences and 3 European institutions as lectures. In addition, the research fellow, Dr Ferenc Simon, was invited to complete a 'habilitation' at the University of Vienna. This entitled him for the title 'Dr habil' and provided him with a permit to teach independent university courses. The fellow also obtained the highest recognised award for young scientists from the Hungarian Academy of Sciences, the 'talentum award', which additionally involved several media appearances in private and public television and in the national radio broadcast programmes. He was finally invited to contribute to a popular science journal, called Interpress, with a paper on nanotechnology. These latter activities therefore contributed to the popularisation of science and increased its accessibility by the broader public.