2015/04/26 by C. Mirri, A. Dusza, Sandra Bastelberger +8 · 47 citations
Materials Science · Physics and Astronomy · #Anisotropy #Antiferromagnetism #Condensed matter physics #Electrical resistivity and conductivity #Iron-based superconductors research #Liquid crystal #Materials science #Optics #Orthorhombic crystal system #Phase (matter) #Physics #Physics of Superconductivity and Magnetism #Rare-earth and actinide compounds #Tetragonal crystal system #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevlett.115.107001
published in Physical Review Letters 115(10), 107001 (American Physical Society) · figures with low resolution because of limit by upload
arxiv created 2015/04/26 · openalex publication_date 2015/09/01 · arxiv updated 2015/09/04 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We perform, as a function of uniaxial stress, an optical-reflectivity investigation of the representative "parent" ferropnictide BaFe(2)As(2) in a broad spectral range, across the tetragonal-to-orthorhombic phase transition and the onset of the long-range antiferromagnetic (AFM) order. The infrared response reveals that the dc transport anisotropy in the orthorhombic AFM state is determined by the interplay between the Drude spectral weight and the scattering rate, but that the dominant effect is clearly associated with the metallic spectral weight. In the paramagnetic tetragonal phase, though, the dc resistivity anisotropy of strained samples is almost exclusively due to stress-induced changes in the Drude weight rather than in the scattering rate, definitively establishing the anisotropy of the Fermi surface parameters as the primary effect driving the dc transport properties in the electronic nematic state.