Condensed Matter Physics, 2008, vol. 11, No. 3(55), p. 483-493

Title: Spin fluctuations and the "strange metal" behavior of a weakly doped antiferromagnet
  V.M. Loktev (Bogolyubov Institute for Theoretical Physics, Metrologichna Str. 14-b, Kyiv, 03680 Ukraine) ,
  V. Turkowski (Department of Physics and Astronomy, University of Missouri, Columbia, Missouri 65211, USA)

We analyze the spectral properties of a phenomenological model for a weakly doped two-dimensional antiferromagnet, in which the carriers move within one of the two sublattices where they were introduced. Such a constraint results in the free carrier spectra with the maxima at k=(± π/2 , ± π/2) observed in some cuprates. We consider the spectral properties of the model by taking into account fluctuations of the spins in the antiferromagnetic background. We show that such fluctuations lead to a non-pole-like structure of the single-hole Green's function and these fluctuations can be responsible for some anomalous "strange metal" properties of underdoped cuprates in the nonsuperconducting regime.

Key words: cuprate superconductors, underdoped regime, pseudogap
PACS: 74.20.-z, 74.20.Fg, 74.20.Rp, 74.72.-h

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