Volume 96, Number 1, October 2011
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||16 September 2011|
Complete renormalization group calculation up to two-loop order of an effective two-band model for iron-based superconductors
Instituto de Física, Universidade Federal de Goiás - 74.001-970, Goiânia-GO, Brazil
Accepted: 17 August 2011
We perform a renormalization group (RG) study up to two-loop order of an effective low-energy two-band model to describe some of the recently discovered iron-based superconductors. Our starting point is the itinerant electronic model proposed by Chubukov et al. (Phys. Rev. B, 78 (2008) 134512), which displays two small, almost nested Fermi pockets with one hole pocket centered at (0,0) and one electron pocket centered at Q=(π, π) in the folded Brillouin zone. We then proceed to implement a complete two-loop RG calculation for this model of four-point vertex corrections, quasiparticle weight and several order parameter susceptibilities in order to evaluate the robustness of one-loop RG results available in the literature with respect to including self-energy effects and higher-order quantum fluctuations.
PACS: 74.20.Mn – Nonconventional mechanisms / 74.20.-z – Theories and models of superconducting state / 71.27.+a – Strongly correlated electron systems; heavy fermions
© EPLA, 2011
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.