By Heike Pfau

This thesis explores thermal delivery in chosen rare-earth-based intermetallic compounds to respond to questions of significant present curiosity. It additionally sheds gentle at the interaction of Kondo physics and Fermi floor changes. 
By acting thermal conductivity and electric resistivity measurements at temperatures as little as 25mK, the writer demonstrates that the Wiedemann–Franz legislation, a cornerstone of steel physics, is violated at exactly the magnetic-field-induced quantum serious element of the heavy-fermion steel YbRh2Si2. This first-ever statement of a contravention has dramatic results, because it implies a breakdown of the quasiparticle picture. 
Utilizing an leading edge strategy to degree low-temperature thermal shipping isothermally as a functionality of the magnetic box, the thesis translates particular, partially newly chanced on, high-field transitions in CeRu2Si2 and YbRh2Si2 as Lifshitz transitions with regards to a transformation within the Fermi surface.
 
Lastly, by way of employing this new strategy to thermal conductivity measurements of the skutterudite superconductor LaPt4Ge12, the thesis proves that the approach is a standard superconductor with a unmarried strength hole. therefore, it refutes the common speculations approximately unconventional Cooper pairing during this material.

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