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

作者：Weng Zheng Yu^*

来源：Physica E: Low-Dimensional Systems and Nanostructures , 2009, 41(7): 1281-1284.

DOI：10.1016/j.physe.2009.02.015

• Low-dimensional
• Multibands
• Magnetism
• Superconductivity

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 fluctuating 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 gaps" for the multiband d-electrons near the Fermi energy.

• 出版日期2009-6
• 单位清华大学