Competing Pairing Symmetries in a Generalized Two-Orbital Model for the Pnictide Superconductors

Andrew Nicholson, Weihao Ge, Xiaotian Zhang, José Riera, Maria Daghofer, Andrzej M. Oleś, George B. Martins, Adriana Moreo, and Elbio Dagotto
Phys. Rev. Lett. 106, 217002 – Published 24 May 2011
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Abstract

We introduce and study an extended “tUJ” two-orbital model for the pnictides that includes Heisenberg terms deduced from the strong coupling expansion. Including these J terms explicitly allows us to enhance the strength of the (π,0)(0,π) spin order which favors the presence of tightly bound pairing states even in the small clusters that are here exactly diagonalized. The A1g and B2g pairing symmetries are found to compete in the realistic spin-ordered and metallic regime. The dynamical pairing susceptibility additionally unveils low-lying B1g states, suggesting that small changes in parameters may render any of the three channels stable.

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  • Received 5 October 2010

DOI:https://doi.org/10.1103/PhysRevLett.106.217002

© 2011 American Physical Society

Authors & Affiliations

Andrew Nicholson1,2, Weihao Ge1,2, Xiaotian Zhang1,2, José Riera3, Maria Daghofer4, Andrzej M. Oleś5,6, George B. Martins7, Adriana Moreo1,2, and Elbio Dagotto1,2

  • 1Department of Physics and Astronomy, The University of Tennessee, Knoxville, Tennessee 37996, USA
  • 2Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 32831, USA
  • 3Instituto de Física Rosario, Universidad Nacional de Rosario, 2000-Rosario, Argentina
  • 4IFW Dresden, P.O. Box 27 01 16, D-01171 Dresden, Germany
  • 5Max-Planck-Institut fur Festkorperforschung, Heisenbergstrasse 1, 70569 Stuttgart, Germany
  • 6M. Smoluchowski Institute of Physics, Jagellonian University, Reymonta 4, 30-059 Kraków, Poland
  • 7Department of Physics, Oakland University, Rochester, Michigan 48309, USA

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Issue

Vol. 106, Iss. 21 — 27 May 2011

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