Abstract
A spin-rotation-invariant Green-function theory for the dynamic spin susceptibility in the anisotropic non-frustrated J 1-J 2 model for the iron pnictides AFe2As2 (A = Ca, Sr, Ba) is presented. The two-spin correlation functions, the spin-excitation spectrum, and the staggered magnetization are calculated self-consistently as functions of temperature and spin. The temperature dependence of the magnetic (uniform static) susceptibility, in particular the linear increase with T in a wide temperature region that is in good quantitative agreement with experiments, is ascribed to a strong in-plane antiferromagnetic short-range order. The values of the Néel temperature resulting from the localized spin model with realistic out-of-plane couplings are found to be much higher than the measured values. From this an extension of the model by including itinerant degrees of freedom is suggested.
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Vladimirov, A.A., Ihle, D. & Plakida, N.M. Magnetic susceptibility and short-range order in iron pnictides: Anisotropic J1-J2 Heisenberg model. Eur. Phys. J. B 87, 112 (2014). https://doi.org/10.1140/epjb/e2014-50152-y
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DOI: https://doi.org/10.1140/epjb/e2014-50152-y