Magnetic softness in iron-based superconductors

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Title:	Magnetic softness in iron-based superconductors
Authors:	Yin, Wei-Guo;Lee, Chi-Cheng;Ku, Wei
Date:	2012-07-17
Issue Date:	2019-10-10 12:10:40 (UTC+8)
Publisher:	IOP Publishing
Abstract:	We examine the relevance of several major material-dependent parameters to the magnetic softness in iron-based superconductors by means of first-principles electronic structure analysis of their parent compounds. The results are explained in the spin-fermion model where localized spins and orbitally degenerate itinerant electrons coexist and are coupled by Hund's rule coupling. We found that the difference in strength of the Hund's rule coupling term is the major material-dependent microscopic parameter for determining the ground-state spin pattern. The magnetic softness in iron-based superconductors is essentially driven by the competition between the double-exchange ferromagnetism and the superexchange antiferromagnetism.
Relation:	Supercond. Sci. Technol. 25, 084007
DOI:	10.1088/0953-2048/25/8/084007
Appears in Collections:	[Graduate Institute & Department of Physics] Journal Article

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