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

Konstantin Kikoin; Stefan Ludwig Drechsler

doi:10.1016/j.jmmm.2012.02.068

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 journal › Article › peer-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 language	English
Pages (from-to)	3471-3475
Number of pages	5
Journal	Journal of Magnetism and Magnetic Materials
Volume	324
Issue number	21
DOIs	https://doi.org/10.1016/j.jmmm.2012.02.068
State	Published - 1 Oct 2012
Externally published	Yes

Keywords

Pnictides

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

Access to Document

10.1016/j.jmmm.2012.02.068

Cite this

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

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.",

keywords = "Pnictides",

author = "Konstantin Kikoin and Drechsler, {Stefan Ludwig}",

note = "Funding Information: We thank the DFG SPP 1458 and the Pakt f{\"u}r Forschung at the IFW Dresden for support and appreciate useful discussions with H. Eschrig, M.N. Kiselev, K. Koepernik , J. M{\'a}lek and J. van den Brink. ",

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T1 - Interplay between magnetic and superconducting order in the non-stoichiometric iron pnictide LaFeAs 1-δO 1-xF x

AU - Kikoin, Konstantin

AU - Drechsler, Stefan Ludwig

N1 - Funding Information: We thank the DFG SPP 1458 and the Pakt für Forschung at the IFW Dresden for support and appreciate useful discussions with H. Eschrig, M.N. Kiselev, K. Koepernik , J. Málek and J. van den Brink.

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N2 - 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.

AB - 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.

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