Interplay between magnetic and superconducting order in the non-stoichiometric iron pnictide LaFeAs 1-δO 1-xF x

Konstantin Kikoin, Stefan Ludwig Drechsler

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

It is shown that As vacancies in the LaFeAsO superconductor induce a strong enhancement of the paramagnetic response both in the normal and the superconducting state. Although As vacancies themselves are non-magnetic defects, they are able to form localized magnetic moments due to strong covalent bonding with neighboring Fe ions. The microscopic theory of magnetic moment formation in semi-metallic state of non-stoichiometric LaFeAsO is constructed in a framework of appropriately modified Anderson-Wolff model. Experimental manifestations of enhanced paramagnetism and the influence of magnetic fluctuations on superconducting pairing are briefly discussed.

Original languageEnglish
Pages (from-to)3471-3475
Number of pages5
JournalJournal of Magnetism and Magnetic Materials
Volume324
Issue number21
DOIs
StatePublished - 1 Oct 2012
Externally publishedYes

Keywords

  • Pnictides

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