[seminar] Seminar na IF-u, 25. rujna 2014. u 15:00h

[Osor Barisic]

Institut za fiziku, Bijenička cesta 46, 


predavaonica u zgradi Mladen Paić 

četvrtak, 25. rujna 2014., u 15:00 sati 









Resistivity and Seebeck coefficient in bad metals from dynamical mean-field theory: what do the values tell? 

Dr. Jernej Mravje 

Jožef Stefan Institute, Ljubljana, Slovenia 




The seminar is about bad-metals, materials in which the resistivity is metallic (increasing with temperature), but reaches and overcomes values that correspond to a Mott-Ioffe-Regel (MIR) limit that corresponds to a scattering event on every lattice site. Our recent results on a doped Mott insulator described within the dynamical-mean-field theory show that well-identified peaks in the single-particle spectral function persist all the way to the MIR limit and that the transport can be described in terms of such "resillient-quasiparticle" states well also at such elevated temperatures. When MIR limit is exceeded, the resillient quasiparticles disappear, only atomic satellites persist in the spectra and the transport becomes controlled by effective carrier number rather than the scattering. The second part of the seminar will focus on the Seebeck effect. Ruthenates universally have Seebeck coefficient of about 30microV/K near and above room temperature. I will describe DMFT results that show that this is associated to a partly coherent state with fluctuating spins but quenched orbital moments. 




Voditelji seminara IF-a: Nikša Krstulović i Osor Bari šić 


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