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Pressure effects on magnetically driven electronic nematic states in iron pnictide superconductors

Jiangping Hu, Chandan Setty, and Steve Kivelson
Phys. Rev. B 85, 100507(R) – Published 26 March 2012

Abstract

In a magnetically driven electronic nematic state, an externally applied uniaxial strain rounds the nematic transition and increases the magnetic transition temperature. We study both effects in a simple classical model of the iron pnictides expressed in terms of local SO(N) spins (with N=3) which we solve to leading order in 1/N. The magnetic transition temperature is shown to increase linearly in response to an external strain while a sharp crossover, which is a remnant of the nematic transition, can only be identified for extremely small strain. We show that these results can reasonably account for recent neutron experimental data in BaFe2As2 by C. Dhital et al. [Phys. Rev. Lett. 108, 087001 (2012)].

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  • Received 30 January 2012

DOI:https://doi.org/10.1103/PhysRevB.85.100507

©2012 American Physical Society

Authors & Affiliations

Jiangping Hu1,2, Chandan Setty2, and Steve Kivelson3

  • 1Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China
  • 2Department of Physics, Purdue University, West Lafayette, Indiana 47907, USA
  • 3Department of Physics, Stanford University, Stanford, California 94305, USA

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Issue

Vol. 85, Iss. 10 — 1 March 2012

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