Direct interplay between superconductivity and ferromagnetism in Fe1+y(Te0.5Se0.5)

Sunil K. Karna, Han Hsu, Chi Yen Li, Shin Bin Liu, Chi Hung Lee, Wen Hsien Li, Raman Sankar, Fang Cheng Chou

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Abstract

Two ferromagnetic phases have been identi fied in the Fe-excess Fe1+y(Te0.5Se0.5) compounds, where the nonstoichiometric 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.

Original languageEnglish
Article number074709
JournalJournal of the Physical Society of Japan
Volume83
Issue number7
DOIs
StatePublished - 15 Jul 2014

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