Research

Superconductivity

Superconductivity is phenomenon, when material (superconductor) is cooled below a critical temperature and its resistivity to an electric current disappears, thereby enabling the transportation of electricity with no loss of energy. Since discovery of superconductivity in 1911, great progress was done in the understanding of superconductivity. However, the physical mechanism leading to high temperature superconductivity, discovered in 1986, remains one of the most challenging issues of modern solid-state physics. Indeed, the conventional electron-phonon coupling mechanism (BCS theory 1957) cannot explain such high critical temperatures. In 2001, team from CLTP in Košice shown the first experimental evidence of the two-gap superconductivity in MgB2 [P. Szabó et al., Phys. Rev. Lett. 87 (2001), 137005]. Another work with a significant response was first spectroscopic evidence of the two-band superconductivity in the “122” family of iron pnictides [P. Szabó et al.,Phys. Rev. B 79 (2009) 012503]. At present, superconductivity group of CLTP is focused on physics of multiband  superconductivity and superconductivity with competing orders (charge density waves) and superconductor-insulator transition.   

Strongly correlated systems

Behaviour of strongly correlated systems materials is hard to describe theoretically because strong interactions between particles produce phenomena that cannot be predicted by studying the behaviour of individual particles alone. In case of magnetic systems, low temperature interactions like the Kondo effect can screen magnetic moments of certain materials (e.g., those containing some lanthanoids and actinoids), resulting in a loss of degrees of freedom. The system can compensate this loss by forming a narrow density of states structure right at the Fermi energy. This many body resonance gives rise to a variety of exciting low temperature properties such as Fermi- and non-Fermi liquid, heavy fermion behaviour, intermediate valence or heavy fermion superconductivity. By means of measurements at very low temperatures (mK), at high magnetic fields (H > 10 T) and hydrostatic pressure, it is possible to derive the most important interaction mechanisms and establish the relevant phase diagrams. The team from CLTP has long standing experience of study strongly correlated electron systems e.g. SmB6 [P. Hlawenka et al. Nature Comm. 9 (2018), 517] and TmB4[Mat. Orendáč et al., Scientific rep. 8 (2018) 10933]

Superfluid 3He physics

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