Preemptive nematic order, pseudogap, and orbital order in the iron pnictides

R. M. Fernandes, A. V. Chubukov, J. Knolle, I. Eremin, and J. Schmalian
Phys. Rev. B 85, 024534 – Published 25 January 2012; Erratum Phys. Rev. B 85, 109901 (2012)

Abstract

Starting from a microscopic itinerant model, we derive and analyze the effective low-energy model for collective magnetic excitations in the iron pnictides. We show that the stripe magnetic order is generally preempted by an Ising-nematic order, which breaks C4 lattice symmetry but preserves O(3) spin-rotational symmetry. This leads to a rich phase diagram as function of doping, pressure, and elastic moduli, displaying split magnetic and nematic tricritical points. The nematic transition may instantly bring the system to the verge of a magnetic transition, or it may occur first, being followed by a magnetic transition at a lower temperature. In the latter case, the preemptive nematic transition is accompanied by either a jump or a rapid increase of the magnetic correlation length, triggering a pseudogap behavior associated with magnetic precursors. Furthermore, due to the distinct orbital character of each Fermi pocket, the nematic transition also induces orbital order. We compare our results to various experiments, showing that they correctly address the changes in the character of the magnetostructural transition across the phase diagrams of different compounds, as well as the relationship between the orthorhombic and magnetic order parameters.

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  • Received 9 October 2011

DOI:https://doi.org/10.1103/PhysRevB.85.024534

©2012 American Physical Society

Erratum

Erratum: Preemptive nematic order, pseudogap, and orbital order in the iron pnictides [Phys. Rev. B 85, 024534 (2012)]

R. M. Fernandes, A. V. Chubukov, J. Knolle, I. Eremin, and J. Schmalian
Phys. Rev. B 85, 109901 (2012)

Authors & Affiliations

R. M. Fernandes1,2,*, A. V. Chubukov3, J. Knolle4, I. Eremin5, and J. Schmalian6

  • 1Department of Physics, Columbia University, New York, New York 10027, USA
  • 2Theoretical Division, Los Alamos National Laboratory, Los Alamos, NM, 87545, USA
  • 3Department of Physics, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA
  • 4Max-Planck-Institut für Physik komplexer Systeme, DE-01187 Dresden, Germany
  • 5Institut für Theoretische Physik III, Ruhr-Universität Bochum, DE-44801 Bochum, Germany
  • 6Institut für Theorie der Kondensierten Materie, Karlsruher Institut für Technologie, DE-76131 Karlsruhe, Germany

  • *rafaelmf@phys.columbia.edu

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Vol. 85, Iss. 2 — 1 January 2012

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