Regensburg 2016 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

TT: Fachverband Tiefe Temperaturen

TT 30: Superconductivity: Fe-based Superconductors - Theory

TT 30.1: Hauptvortrag

Dienstag, 8. März 2016, 11:00–11:30, H19

Selective correlations and heavy-fermionic behaviour in Iron-based superconductors — •Luca de’ Medici — European Synchrotron Radiation Facility, 71 Av. des Martyrs, 38000 Grenoble, France — Ecole Supérieure de Physique et Chimie industrielles de la Ville de Paris, 10 rue Vauquelin, 75005 Paris - France

The matching between recent experimental evidences from various probes and realistic theoretical calculations highlights the coexistence, in the normal phase of Fe-based superconductors, of strongly correlated and weakly correlated electrons. This peculiar situation can be backtracked to the influence of Hund’s coupling exchange interaction between the conduction electrons in these materials, and can be controlled to some degree. In some of these compounds this differentiation can get quite extreme and gives rise to heavy-fermionic behaviour. We will speculate that these and similar d-electron materials could constitute a new ballpark for the exploration of heavy-fermionic physics, and of its applications. A new possible application of the strong thermomagnetic properties that can in principle be found in heavy-fermions is proposed: self-cooling of high-current cables.

[1] L. de’ Medici, G. Giovannetti and M. Capone,

PRL 112, 177001 (2014)

[2] L. de’ Medici in Iron-based Superconductivity,

Springer Series in Materials Science 211, 2015, pp 409-441

[3] L. de’ Medici, ArXiv:1506.01674