Direct interplay between superconductivity and ferromagnetism in Fe1+y(Te0.5Se0.5)
Journal
Journal of the Physical Society of Japan
Journal Volume
83
Journal Issue
7
Pages
074709-1 - 074709-6
Date Issued
2014
Author(s)
Abstract
Two ferromagnetic phases have been identified in the Fe-excess Fe1+y(Te0.5Se0.5) compounds, where the non-stoichiometric Fe ions occupy the interstitial sites that are slightly below the center positions of the Se square sublattice. The low-temperature magnetic phase, which coexists with superconductivity, consists the ordering of the lattice as well as the excess Fe ions. Thermal loosening of the superconducting pairs allows the electrons to flow from the superconducting layers to the interstitial Fe sites, which alters the numbers of Fe2+ ion on the lattice and on the excess sites. It is this valence change of the magnetic sites that drives the system evolves into its magnetic phase in the normal state. Existence of direct interplays between superconductivity and ferromagnetism in Fe1+y(Te0.5Se0.5) is demonstrated.
Publisher
Physical Society of Japan
Type
journal article