Coexistence of ferromagnetism and superconductivity in iron based pnictides: a time resolved magnetooptical study.

ABSTRACT: Ferromagnetism and superconductivity are antagonistic phenomena. Their coexistence implies either a modulated ferromagnetic order parameter on a lengthscale shorter than the superconducting coherence length or a weak exchange coupling between the itinerant superconducting electrons and the localized ordered spins. In some iron based pnictide superconductors the coexistence of ferromagnetism and superconductivity has been clearly demonstrated. The nature of the coexistence, however, remains elusive since no clear understanding of the spin structure in the superconducting state has been reached and the reports on the coupling strength are controversial. We show, by a direct optical pump-probe experiment, that the coupling is weak, since the transfer of the excess energy from the itinerant el

SUBMITTER: Pogrebna A 

PROVIDER: S-EPMC4291556 | biostudies-literature | 2015 Jan

REPOSITORIES: biostudies-literature