Interplay between magnetic and superconducting order in the non-stoichiometric iron pnictide
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- 作者：Konstantin Kikoin ; Stefan-Ludwig Drechsler
- 关键词：Pnictides
- 刊名：Journal of Magnetism and Magnetic Materials
- 出版年：2012
- 出版时间：October, 2012
- 年：2012
- 卷：324
- 期：21
- 页码：3471-3475
- 全文大小：227 K
文摘
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.