Journal
PHYSICAL REVIEW LETTERS
Volume 102, Issue 23, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.102.236403
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Funding
- RFBR [09-02-00127]
- OFN RAS
- APCTP
- NSF-DMR [0645461, 0604406]
- RMHE [2.1.1/3199]
- Laboratoire de Physique des Solides, Universite Paris-Sud (France)
- RTRA Triangle de la Physique
- Direct For Mathematical & Physical Scien [844115] Funding Source: National Science Foundation
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [0604406, 0645461] Funding Source: National Science Foundation
- Division Of Materials Research [844115] Funding Source: National Science Foundation
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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 to be due to the nonanalytic 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. 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 chi(T) strong. We demonstrate that this mechanism is in quantitative agreement with the experiment.
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