Spin-Lattice Coupling and Superconductivity in Fe Pnictides. (31st January 2010)

• Record Type: Journal Article
• Authors: Egami, T.; Fine, B. V.; Parshall, D.; Subedi, A.; Singh, D. J.
• Other Names: Mazin Igor Academic Editor.
• Is Part Of: Advances in condensed matter physics. Volume 2010(2010)
• Publication Date: 2010-01-31
• Subjects: Condensed matter -- Periodicals; Condensed matter; Periodicals; 530.41
• DOI: 10.1155/2010/164916
• Languages: English
• ISSNs: 1687-8124

Abstract

Abstract : We consider strong spin-lattice and spin-phonon coupling in iron pnictides and discuss its implications on superconductivity. Strong magneto-volume effect in iron compounds has long been known as the Invar effect. Fe pnictides also exhibit this effect, reflected in particular on the dependence of the magnetic moment on the atomic volume of Fe defined by the positions of the nearest neighbor atoms. Through the phenomenological Landau theory, developed on the basis of the calculations by the density functional theory (DFT) and the experimental results, we quantify the strength of the spin-lattice interaction as it relates to the Stoner criterion for the onset of magnetism. We suggest that the coupling between electrons and phonons through the spin channel may be sufficiently strong to be an important part of the superconductivity mechanism in Fe pnictides.