Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA.
Phys Rev Lett. 2012 Jul 27;109(4):047001. doi: 10.1103/PhysRevLett.109.047001. Epub 2012 Jul 26.
An undoped three-orbital spin-fermion model for the Fe-based superconductors is studied via Monte Carlo techniques in two-dimensional clusters. At low temperatures, the magnetic and one-particle spectral properties are in agreement with neutron and photoemission experiments. Our main results are the resistance versus temperature curves that display the same features observed in BaFe(2)As(2) detwinned single crystals (under uniaxial stress), including a low-temperature anisotropy between the two directions followed by a peak at the magnetic ordering temperature, that qualitatively appears related to short-range spin order and concomitant Fermi surface orbital order.
通过二维团簇中的蒙特卡罗技术研究了无掺杂的三维轨道自旋费米子模型的 Fe 基超导体。在低温下，磁性和单粒子能谱性质与中子和光发射实验一致。我们的主要结果是电阻与温度曲线，这些曲线显示了在 BaFe(2)As(2)解孪单晶（在单轴应力下）中观察到的相同特征，包括在磁有序温度下两个方向之间的低温各向异性，然后出现峰值，这定性地与短程自旋有序和伴随的费米面轨道有序有关。
