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Title: Spin-Lattice Coupling and Superconductivity in Fe Pnictides

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.
Authors:
 [1] ;  [2] ;  [3] ;  [3] ;  [4]
  1. Department of Materials Science and Engineering, Joint Institute for Neutron Sciences, University of Tennessee, Knoxville, TN 37996, USA, Department of Physics and Astronomy, University of Tennessee, Knoxville, TN 37996, USA, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
  2. Institute for Theoretical Physics, University of Heidelberg, Heidelberg 69120, Germany
  3. Department of Physics and Astronomy, University of Tennessee, Knoxville, TN 37996, USA
  4. Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
Publication Date:
OSTI Identifier:
1198320
Grant/Contract Number:
FG02-08ER46528
Type:
Published Article
Journal Name:
Advances in Condensed Matter Physics
Additional Journal Information:
Journal Volume: 2010; Related Information: CHORUS Timestamp: 2016-08-11 08:06:06; Journal ID: ISSN 1687-8108
Publisher:
Hindawi Publishing Corporation
Sponsoring Org:
USDOE
Country of Publication:
Egypt
Language:
English