Abstract
The hyperfine parameters of hyperfine fields, electric field gradients and isomer shifts at the Fe site are investigated based on the first-principles calculations of the electronic structures using LDA (GGA)+U method in the low-temperature orthorhombic antiferromagnetic phase of undoped BaFe2As2. It is fond that the electric field gradient of Fe nucleus is highly related with the electronic structures close to the Fermi level. Though the addition of negative on-site Coulomb interaction to Fe-3d states improves the calculated magnetic moment of Fe atom and the hyperfine parameters of Fe nucleus when U = −0.1 Ry (−0.08 Ry) for GGA+U (LDA+U) method, a negative U correction does not capture the right physics of this system. The calculations prove the strong coupling between the magnetic, structural and electronic properties in antiferromagnetic BaFe2As2 parent.
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Pang, H., Fang, Y. & Li, F. Hyperfine interactions and electronic structures of BaFe 2 As 2 : a first-principles LDA+U study. Hyperfine Interact 199, 387–396 (2011). https://doi.org/10.1007/s10751-011-0333-5
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DOI: https://doi.org/10.1007/s10751-011-0333-5