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APS » Journals » Phys. Rev. Lett. » Volume 102 » Issue 23
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Phys. Rev. Lett. 102, 236403 (2009) [4 pages]

Nonanalytic Spin Susceptibility of a Fermi Liquid: The Case of Fe-Based Pnictides

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M. M. Korshunov1,2,*, I. Eremin1,3,†, D. V. Efremov4, D. L. Maslov5, and A. V. Chubukov6
1Max-Planck-Institut für Physik komplexer Systeme, D-01187 Dresden, Germany
2L. V. Kirensky Institute of Physics, Siberian Branch of Russian Academy of Sciences, 660036 Krasnoyarsk, Russia
3Institute für Mathematische und Theoretische Physik, Technische Universität Braunschweig, 38106 Braunschweig, Germany
4Institut für Theoretische Physik, Technische Universität Dresden, 01062 Dresden, Germany
5Department of Physics, University of Florida, Gainesville, Florida 32611, USA
6Department of Physics, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA

Received 30 December 2008; published 12 June 2009

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 to be due to the nonanalytic 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. Because of 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.

© 2009 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.102.236403
DOI:
10.1103/PhysRevLett.102.236403
PACS:
71.10.Ay, 74.25.Ha, 74.25.Jb, 75.30.Cr

*maxim@mpipks-dresden.mpg.de

†Also at Kazan State University, 420087 Kazan, Russian Federation.

 
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