SCL Seminar by Darko Tanaskovic

SCL seminar of the Center for the Study of Complex Systems, will be held on Thursday, 25 May 2017 at 14:00 in the library reading room “Dr. Dragan Popović" of the Institute of Physics Belgrade. The talk entitled

"Electronic transport and phonon spectra in bad metals"

will be given by Dr. Darko Tanasković (Scientific Computing Laboratory, Center for the Study of Complex Systems, Institute of Physics Belgrade).

Abstract of the talk:

Materials whose resistivity sharply rises with temperature, reaching the values comparable or even larger than semiclassical Mott-Ioffe-Regel limit for maximal metallic conductivity, are characterized as bad metals. This bad-metal behavior was first identified in the heyday of high-temperature superconductivity, in materials such as La2−xSrxCuO4, but it soon became clear that bad-metal behavior is a much more general feature of materials close to the Mott metal-insulator transition. Indeed, it has been clearly identified also in various oxides, organic Mott systems, as well as more recently discovered families of iron based superconductors.

In this talk we will show how the bad-metal behavior assumes universal features at high temperatures as a consequence of proximity to the Mott metal-insulator transition and existence of the hidden quantum critical point. In the second part of the talk we will briefly review the signatures of the phase transitions which can be seen in the Raman spectra of iron based superconductors and related compounds and explain the role of numerical calculations in the analysis of the phonon spectra.