| Περίληψη: | Strongly correlated electron systems are among the most active research topics in modern condensed matter physics. In strongly correlated materials the electron interaction energies
dominate the electron kinetic energy which leads to unconventional properties. Heavy
fermion compounds form one of the classes of such materials. In heavy fermion compounds
the interaction of itinerant electrons with local magnetic moments generates quasiparticles
with masses up to several 1000 electron masses. This may be accompanied by exciting
properties, such as unconventional superconductivity in a magnetic environment, non-Fermi
liquid behavior and quantum criticality. Strong electronic correlations are responsible for
physical phenomena on a low energy scale. Consequently, these phenomena have to be
studied at low temperatures. This, in turn, requires ultimate quality of single crystals to
avoid that the low temperature intrinsic properties are covered by extrinsic effects due to
off-stoichiometry, impurities or other crystal imperfections.
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