Origin of gap anisotropy in spin fluctuation models of the iron pnictides

Maier, T. A.; Graser, S.; Scalapino, D. J.; Hirschfeld, P. J.

doi:10.1103/physrevb.79.224510

Origin of gap anisotropy in spin fluctuation models of the iron pnictides

Journal Article · Wed Jun 10 00:00:00 EDT 2009 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/physrevb.79.224510· OSTI ID:2484117

Maier, T. A. ^[1]; Graser, S. ^[2]; Scalapino, D. J. ^[3]; Hirschfeld, P. J. ^[4]

Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
University of Augsburg (Germany)
University of California, Santa Barbara, CA (United States)
University of Florida, Gainesville, FL (United States)

We discuss the large gap anisotropy found for the A_1⁢g (s wave) state in random-phase approximation spin fluctuation and functional renormalization-group calculations and show how the simple arguments leading to isotropic sign-switched s-wave states in these systems need to be supplemented by a consideration of pair scattering within Fermi-surface sheets and between the individual electron sheets as well. Additionally, accounting for the orbital makeup of the states on the Fermi surface is found to be crucial.

View Accepted Manuscript (DOE)

Research Organization:: University of Florida, Gainesville, FL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: FG02-05ER46236

OSTI ID:: 2484117

Journal Information:: Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Issue: 22 Vol. 79; ISSN 1098-0121

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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