Antiferromagnetic superexchange interactions in LaOFeAs

Details Antiferromagnetic superexchange interactions in LaOFeAs Antiferromagnetic superexchange interactions in LaOFeAs

2008-04-21

arxiv.org/abs/0804.3370v3

PHYSICAL REVIEW B 78, 224517 (2008)

Physics

Condensed Matter

Materials Science

5 pages and 7 figures; add the appendix to explain how to determine the nearest and next-nearest Fe-Fe exchange interactions J

Scientific paper

10.1103/PhysRevB.78.224517

From first-principles calculations, we have studied the electronic and magnetic structures of the ground state of LaOFeAs. The Fe spins are found to be collinear antiferromagnetic ordered, resulting from the interplay between the strong nearest and next-nearest neighbor superexchange antiferromagnetic interactions. The structure transition observed by neutron scattering is shown to be magnetically driven. Our study suggests that the antiferromagnetic fluctuation plays an important role in the Fe-based superconductors. This sheds light on the understanding of the pairing mechanism in these materials.

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