Thermal Transport in Strongly Correlated Rare-Earth Intermetallic Compounds / Springer Theses (PDF)

Name: Thermal Transport in Strongly Correlated Rare-Earth Intermetallic Compounds / Springer Theses
Brand: Springer-Verlag GmbH
SKU: 80738065
Price: 98.99 EUR
Availability: OnlineOnly

(Sprache: Englisch)

Autor: Heike Pfau

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Thermal Transport in Strongly Correlated Rare-Earth Intermetallic Compounds / Springer Theses, Heike Pfau

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This thesis explores thermal transport in selected rare-earth-based intermetallic compounds to answer questions of great current interest. It also sheds light on the interplay of Kondo physics and Fermi surface changes.
By performing thermal conductivity...

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By performing thermal conductivity and electrical resistivity measurements at temperatures as low as 25mK, the author demonstrates that the Wiedemann-Franz law, a cornerstone of metal physics, is violated at precisely the magnetic-field-induced quantum critical point of the heavy-fermion metal YbRh2Si2. This first-ever observation of a violation has dramatic consequences, as it implies a breakdown of the quasiparticle picture.

Utilizing an innovative technique to measure low-temperature thermal transport isothermally as a function of the magnetic field, the thesis interprets specific, partly newly discovered, high-field transitions in CeRu2Si2 and YbRh2Si2 as Lifshitz transitions related to a change in the Fermi surface.

Lastly, by applying this new technique to thermal conductivity measurements of the skutterudite superconductor LaPt4Ge12, the thesis proves that the system is a conventional superconductor with a single energy gap. Thus, it refutes the widespread speculations about unconventional Cooper pairing in this material.