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

机译:压力对铁氧超导体中磁驱动电子向列态的压力影响

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摘要

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 BaFe_2 As_2 by C. Dhital et al. [Phys. Rev. Lett. 108, 087001 (2012)].
机译:在磁驱动电子向列状态下,外部施加的单轴应变使向列转变变圆并增加了磁性转变温度。我们在简单的经典铁模型模型中研究了这两种效应,它们用局部SO(N)自旋(N = 3)表示,我们将其求解为1 / N的前导顺序。示出了磁转变温度响应于外部应变而线性增加,而仅向极小的应变识别出向列转变的残余的急剧的交叉。我们表明,这些结果可以合理地解释C. Dhital等人在BaFe_2 As_2中最近的中子实验数据。 [物理牧师108,087001(2012)]。

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