Physics – Condensed Matter – Superconductivity
Scientific paper
2009-08-29
Physics
Condensed Matter
Superconductivity
Scientific paper
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.
Dai Pengcheng
Egami Takeshi
Fine Boris V.
la Cruz Clarina de
Parshall D.
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