Spin-Phonon Coupling in Iron Pnictide Superconductors
T. Egami, B. V. Fine, D. J. Singh, D. Parshall, C. de la Cruz, P., Dai
TL;DR
This paper investigates how spin-lattice interactions influence magnetic moments and potentially superconductivity in iron pnictides, proposing a theoretical framework linking structural changes to magnetic and superconducting properties.
Contribution
It introduces a Landau theory describing spin-lattice coupling effects on magnetic moments and explores their possible role in iron pnictide superconductivity.
Findings
Spin-lattice coupling affects magnetic moments in iron pnictides.
The theory correlates Fe-As layer separation with magnetic moments.
Spin-phonon interactions may influence superconducting properties.
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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