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By Heike Pfau
This thesis explores thermal delivery in chosen rare-earth-based intermetallic compounds to reply to questions of serious present curiosity. It additionally sheds mild at the interaction of Kondo physics and Fermi floor adjustments.
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 aspect of the heavy-fermion steel YbRh2Si2. This first-ever commentary of a contravention has dramatic results, because it implies a breakdown of the quasiparticle photograph.
Utilizing an cutting edge strategy to degree low-temperature thermal shipping isothermally as a functionality of the magnetic box, the thesis translates particular, in part newly chanced on, high-field transitions in CeRu2Si2 and YbRh2Si2 as Lifshitz transitions with regards to a metamorphosis within the Fermi floor. finally, via employing this new strategy to thermal conductivity measurements of the skutterudite superconductor LaPt4Ge12, the thesis proves that the process is a standard superconductor with a unmarried strength hole. hence, it refutes the common speculations approximately unconventional Cooper pairing during this material.
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Oda, H. Nagano, Y. Onuki, K. Shibutani, T. Komatsubara, Coherent Kondo state in a dense Kondo substance: Cex La1−x Cu6 . J. Phys. Soc. Jpn. 55, 1294 (1986) L. Tewordt, T. Wölkhausen, Theory of thermal conductivity of the lattice for high-Tc superconductors. Solid State Commun. 70, 839 (1989) M. Tinkham, Introduction to Superconductivity, ed. J. S. W. Y. G. Klemens, Thermophysical Properties of Matter— Thermal Conductivity, vol. 1–3 (IFI/Plenum New York-Washington, 1970) A. Varlamov, V. Egorov, A.
An example is electron-phonon scattering at low temperatures T < . 4 Thermopower A very sensitive transport property in a metal is its thermopower S. 50) F which is called Mott formula. e denotes the elementary charge and the energy. In a Fermi liquid, the thermopower usually becomes linear in T at low temperatures. 51) which demonstrates the sensitivity of the thermopower to Fermi-surface properties. 52) where n is the total electron concentration, N the density of states and τ the scattering time.
Thermal fluctuations drive the transition at finite T , but the regime where they dominate becomes smaller for smaller Tc (dark green). The disordered phase is separated into three regions: B thermally disordered, C quantum critical, and D quantum disordered, which are separated by crossovers (dashed lines) Thus, at any finite-temperature phase transition, quantum fluctuations will become unimportant close enough to Tc and the phase transition can be described classically. g. pressure or magnetic field.