Nematic State of Pnictides Stabilized by Interplay between Spin, Orbital, and Lattice Degrees of Freedom

Shuhua Liang, Adriana Moreo, and Elbio Dagotto

Phys. Rev. Lett. 111, 047004 – Published 24 July 2013

Abstract

The nematic state of the iron-based superconductors is studied in the undoped limit of the three-orbital ( $x z$ , $y z$ , $x y$ ) spin-fermion model via the introduction of lattice degrees of freedom. Monte Carlo simulations show that in order to stabilize the experimentally observed lattice distortion and nematic order, and to reproduce photoemission experiments, both the spin-lattice and orbital-lattice couplings are needed. The interplay between their respective coupling strengths regulates the separation between the structural and Néel transition temperatures. Experimental results for the temperature dependence of the resistivity anisotropy and the angle-resolved photoemission orbital spectral weight are reproduced by the present numerical simulations.

Received 7 May 2013

DOI:https://doi.org/10.1103/PhysRevLett.111.047004

Authors & Affiliations

Shuhua Liang, Adriana Moreo, and Elbio Dagotto

Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37966, USA
Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA