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arXiv · 0901.0238

Non-analytic spin susceptibility of a nested Fermi liquid: the case of Fe-based pnictides

M. M. Korshunov·I. Eremin·D. V. Efremov·D. L. Maslov·A. V. Chubukov
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Abstract

We propose an explanation of the peculiar linear temperature dependence of the uniform spin susceptibility $χ(T)$ in ferropnictides. We argue that the linear in $T$ term appears due to non-analytic temperature dependence of $χ(T)$ in a two-dimensional Fermi liquid. We show that the prefactor of the $T$ term is expressed via the square of the spin-density-wave (SDW) amplitude connecting nested hole and electron pockets. Due to an incipient SDW instability, this amplitude is large, which, along with a small value of the Fermi energy, makes the $T$ dependence of $χ(T)$ strong. We demonstrate that this mechanism is in quantitative agreement with the experiment.

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M. M. Korshunov, I. Eremin, D. V. Efremov, D. L. Maslov, A. V. Chubukov. 2009-01-02. Non-analytic spin susceptibility of a nested Fermi liquid: the case of Fe-based pnictides. https://doi.org/10.1103/physrevlett.102.236403

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