Interplay between magnetic and superconducting order in the non-stoichiometric iron pnictide LaFeAs 1-δ O 1-x F x
Interplay between magnetic and superconducting order in the non-stoichiometric iron pnictide LaFeAs 1-δ O 1-x F x
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非化学计量铁磷化物 LaFeAs 1-δ O 1-x F x 中磁序和超导序之间的相互作用
DOI：
10.1016/j.jmmm.2012.02.068
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发表时间：
2012
影响因子：
2.7
通讯作者：
S. Drechsler
中科院分区：
文献类型：
--
作者：
K. Kikoin;S. Drechsler
结果表明，在正常态和超导态下，LaFeAsO超导体中的As空位都会引起顺磁响应的强烈增强。虽然As空位本身是非磁性缺陷，但由于它们与邻近的Fe离子有很强的共价键，所以能够形成局域磁矩。在适当修正的Anderson-Wolff模型框架下，建立了非化学计量比LaFeAsO半金属态磁矩形成的微观理论。简要讨论了顺磁性增强的实验表现和磁涨落对超导配对的影响。
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.
影响因子：
8.6
作者：
Fletcher, J. D.;Serafin, A.;Carrington, A.
通讯作者：
Carrington, A.