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Spin-Lattice Coupling and Superconductivity in Fe Pnictides

Journal

ADVANCES IN CONDENSED MATTER PHYSICS
Volume 2010, Issue -, Pages -

Publisher

HINDAWI LTD
DOI: 10.1155/2010/164916

Keywords

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Funding

  1. Department of Energy, Office of Basic Sciences through EPSCoR [DE-FG02-08ER46528]
  2. Scientific User Facilities Division
  3. Division of Materials Science and Engineering, Office of Basic Energy Sciences, Department of Energy

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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.

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