Physics – Condensed Matter – Superconductivity
Scientific paper
2009-01-02
Phys. Rev. Lett. 102, 236403 (2009)
Physics
Condensed Matter
Superconductivity
4.1 pages, 2 figures
Scientific paper
10.1103/PhysRevLett.102.236403
We propose an explanation of the peculiar linear temperature dependence of the uniform spin susceptibility $\chi(T)$ in ferropnictides. We argue that the linear in $T$ term appears due to non-analytic temperature dependence of $\chi(T)$ 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 $\chi(T)$ strong. We demonstrate that this mechanism is in quantitative agreement with the experiment.
Chubukov Andrey V.
Efremov Dmitri V.
Eremin Ilya
Korshunov Maxim M.
Maslov Dmitrii L.
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