Spin-Phonon Coupling in Iron Pnictide Superconductors

Abstract

The magnetic moment in the parent phase of the iron-pnictide superconductors varies with composition even when the nominal charge of iron is unchanged. We propose the spin-lattice coupling due to the magneto-volume effect as the primary origin of this effect, and formulate a Landau theory to describe the dependence of the moment to the Fe-As layer separation. We then compare the superconductive critical temperature of doped iron pnictides to the local moment predicted by the theory, and suggest that the spin-phonon coupling may play a role in the superconductivity of this compound.

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Cited by in corpus (8)

• Magneto-elastic quantum fluctuations and phase transitions in the iron superconductors
• Close correlation between magnetic properties and the soft phonon mode of the structural transition in BaFe${}_2$As${}_2$ and SrFe${}_2$As${}_2$
• Effect of the isoelectronic substitution of Sb for As on the magnetic and structural properties of LaFe(As1-xSbx)O
• Phonon spectrum of SrFe2As2 determined using multizone phonon refinement
• Dynamical spin susceptibility of spin-valley half-metal
• Spin excitation spectrum of high-temperature cuprate superconductors from finite cluster simulations
• A Mössbauer study of the magneto-structural coupling effect in SrFe${}_2$As${}_2$ and SrFeAsF
• Local Structure of Functional Solids