• Featured in Physics
  • Editors' Suggestion

Interplay between magnetic properties and Fermi surface nesting in iron pnictides

A. N. Yaresko, G.-Q. Liu, V. N. Antonov, and O. K. Andersen
Phys. Rev. B 79, 144421 – Published 16 April 2009
Physics logo See Synopsis: Magnetic order is no match for the lattice

Abstract

The wave-vector (q) and doping (x,y) dependences of the magnetic energy, iron moment, and effective exchange interactions in LaFeAsO1xFx and Ba12yK2yFe2As2 are studied by self-consistent LSDA calculations for co-planar spin spirals. For the undoped compounds (x=0,y=0), the minimum of the calculated total energy, E(q), is for q corresponding to stripe antiferromagnetic order. Already at low levels of electron doping (x), this minimum becomes flat in LaFeAsO1xFx and for x5%, it shifts to an incommensurate q. In Ba12yK2yFe2As2, stripe order remains stable for hole doping up to y=0.3. These results are explained in terms of the band structure. The magnetic interactions cannot be accurately described by a simple classical Heisenberg model and the effective exchange interactions fitted to E(q) depend strongly on doping. The doping dependence of the E(q) curves is compared with that of the noninteracting magnetic susceptibility for which similar trends are found.

  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
1 More
  • Received 24 October 2008

DOI:https://doi.org/10.1103/PhysRevB.79.144421

©2009 American Physical Society

Synopsis

Key Image

Magnetic order is no match for the lattice

Published 27 April 2009

Density-functional calculations provide a comprehensive picture of how magnetic order evolves with doping in two iron pnictide compounds.

See more in Physics

Authors & Affiliations

A. N. Yaresko, G.-Q. Liu, V. N. Antonov, and O. K. Andersen

  • Max-Planck-Institut für Festkörperforschung, Heisenbergstraße 1, D-70569 Stuttgart, Germany

Article Text (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand
Issue

Vol. 79, Iss. 14 — 1 April 2009

Reuse & Permissions
Access Options
Author publication services for translation and copyediting assistance advertisement

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review B

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×