Issue
EPL
Volume 85, Number 6, March 2009
Article Number 67009
Number of page(s) 5
Section Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties
DOI http://dx.doi.org/10.1209/0295-5075/85/67009
Published online 07 April 2009
EPL, 85 (2009) 67009
DOI: 10.1209/0295-5075/85/67009

Striped antiferromagnetism and electronic structures of SrFeAsF and their implications

Li-Fang Zhu and Bang-Gui Liu

Institute of Physics, Chinese Academy of Sciences - Beijing 100190, China and Beijing National Laboratory for Condensed Matter Physics - Beijing 100190, China

bgliu@mail.iphy.ac.cn

received 8 February 2009; accepted in final form 3 March 2009; published March 2009
published online 7 April 2009

Abstract
We investigate structural, magnetic, and electronic properties of SrFeAsF as a new parent for superconductors using a state-of-the-art density-functional theory method. Calculated results show that the striped antiferromagnetic order is the magnetic ground state in the Fe layer and the interlayer magnetic interaction is tiny. Calculated As and Sr positions are in good agreement with experiment. There are only two quasi–two-dimensional bands near the Fermi level. The valence charge is mainly in the Fe and F layers, and the magnetic moment is confined to the Fe atoms. All the spin couplings within the Fe layer are antiferromagnetic due to the superexchange through the nearest As atoms. These results, with the record-equaling phase-transition temperature in the latest Sm-doped SrFeAsF, show that the SrFeAsF, sharing the same structure with LaFeAsO, is promising for achieving better superconductors.

PACS
75.30.-m - Intrinsic properties of magnetically ordered materials.
74.10.+v - Occurrence, potential candidates.
75.10.-b - General theory and models of magnetic ordering.

© EPLA 2009