Hidden SDW order and effective low-energy theory for FeAs superconductors

Details Hidden SDW order and effective low-energy theory for FeAs superconductors Hidden SDW order and effective low-energy theory for FeAs superconductors

2008-04-21

arxiv.org/abs/0804.3228v2

Physica E41, 1281 (2009)

Physics

Condensed Matter

Superconductivity

5 pages, 2 figures; some typos are corrected and minor changes are made

Scientific paper

10.1016/j.physe.2009.02.015

We propose a simple effective model to describe FeAs superconductors. This model is based on the assumption of a local spin-density-wave (SDW) order, with its magnetization direction allowed to fluctuate. It is shown that the long-range order with momentum Q=(\pi ,\pi) is generally unstable in competing with the kinetic energy of the charge carriers. A true weak SDW order is formed in the undoped case with an additional momentum shift Q_s=(\pi, 0) due to the peculiar Fermi surface nesting. In the doped case, the unstable long-range order driven by kinetic energy can naturally result in a d-wave superconducting condensation. Such low-energy physics is protected by the presence of the local SDW which sustains some kind of "Mott gags" for the multiband d-electrons near the Fermi energy.

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