Direct observation of a Fermi liquid-like normal state in an iron-pnictide superconductor.

ABSTRACT: There are two prerequisites for understanding high-temperature (high-Tc) superconductivity: identifying the pairing interaction and obtaining a correct description of the normal state from which superconductivity emerges. The nature of the normal state of iron-pnictide superconductors, and the role played by correlations arising from partially screened interactions, are still under debate. Here we show that the normal state of carefully annealed electron-doped BaFe(2-x)Co(x)As2 at low temperatures has all the hallmark properties of a local Fermi liquid, with a more incoherent state emerging at elevated temperatures, an identification made possible using bulk-sensitive optical spectroscopy with high frequency and temperature resolution. The frequency dependent scattering rate extracted from

SUBMITTER: Tytarenko A 

PROVIDER: S-EPMC5378886 | biostudies-literature | 2015 Jul

REPOSITORIES: biostudies-literature