2005/12/13 by V. Zlatić, Zlatic, V., R. Monnier +5 · 1 citation
Materials Science · Physics and Astronomy · #Advanced Thermodynamics and Statistical Mechanics #Advanced Thermoelectric Materials and Devices #FOS: Physical sciences #Strongly Correlated Electrons (cond-mat.str-el) #Thermal properties of materials
paper · pdf · doi:10.48550/arxiv.cond-mat/0512288
openalex publication_date 2005/12/13 · openalex created_date 2019/06/27 · openalex updated_date 2026/07/28
A number of recent experiments report the low-temperature thermopower α and specific heat coefficients γ=CV/T of strongly correlated electron systems. Describing the charge and heat transport in a thermoelectric by transport equations, and assuming that the charge current and the heat current densities are proportional to the number density of the charge carriers, we obtain a simple mean-field relationship between α and the entropy density \cal S of the charge carriers. We discuss corrections to this mean-field formula and use results obtained for the periodic Anderson and the Falicov-Kimball models to explain the concentration (chemical pressure) and temperature dependence of α/γT in EuCu2(Ge1-xSix)2, CePt1-xNix, and YbIn1-xAgxCu4 intermetallic compounds. % We also show, using the 'poor man's mapping' which approximates the periodic Anderson lattice by the single impurity Anderson model, that the seemingly complicated behavior of α(T) can be explained in simple terms and that the temperature dependence of α(T) at each doping level is consistent with the magnetic character of 4\it f ions.