Journal
PHYSICAL REVIEW LETTERS
Volume 115, Issue 10, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.115.107001
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Funding
- Swiss National Science Foundation (SNSF)
- Department of Energy, Office of Basic Energy Sciences [DE-AC02-76SF00515]
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We perform, as a function of uniaxial stress, an optical-reflectivity investigation of the representative parent ferropnictide BaFe2As2 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.
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