Spin-lattice coupling in iron-pnictide superconductors

T. Egami, B. V. Fine, D. J. Singh, D. Parshall, C. De La Cruz, P. Dai

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)S294-S295
JournalPhysica C: Superconductivity and its Applications
Volume470
Issue numberSUPPL.1
DOIs
Publication statusPublished - Dec 2010
Externally publishedYes

Keywords

  • Iron pnictides
  • Magneto-volume effect
  • Phonons
  • Spin-phonon coupling

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