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Reduced iron ordered moment and negative T C -pressure coefficient in iron-arsenide superconductors

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  • Guo-Qiang Liu

Abstract

The striped antiferromagnetic phase of iron-arsenides is investigated by the density functional calculations including Coulomb repulsion. Two low moment solutions with m ≈ 0.4 μ B and m ≈ 1.0 μ B have been found from calculations. The electronic structures indicate that the low moment states originate in the strong orbital hybridization between antiferromagnetic Fe neighbors. Therefore, the geometry of FeAs 4 tetrahedron, which is characterized by a parameter of h As /a, is crucial to the low moment states. We show that the puzzling negative T C -pressure coefficient of iron-arsenides can be consistently explained by the obtained low moment states. Copyright EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2015

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  • Guo-Qiang Liu, 2015. "Reduced iron ordered moment and negative T C -pressure coefficient in iron-arsenide superconductors," The European Physical Journal B: Condensed Matter and Complex Systems, Springer;EDP Sciences, vol. 88(3), pages 1-9, March.
    • Handle: RePEc:spr:eurphb:v:88:y:2015:i:3:p:1-9:10.1140/epjb/e2015-50780-7
    DOI: 10.1140/epjb/e2015-50780-7
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    Solid State and Materials;

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