Pressure Effects on Magnetically-Driven Electronic Nematic States in Iron-Pnictides

Details Pressure Effects on Magnetically-Driven Electronic Nematic States in Iron-Pnictides Pressure Effects on Magnetically-Driven Electronic Nematic States in Iron-Pnictides

2012-01-25

arxiv.org/abs/1201.5174v1

Phys. Rev. B 85, 100507(R) (2012)

Physics

Condensed Matter

Superconductivity

4 pages and 4 figures

Scientific paper

10.1103/PhysRevB.85.100507

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 e?ects 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 identi?ed for extremely small strain. We show that these results can reasonably account for recent neutron experimental data in BaFe2As2 by C. Dhital et al [1].

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