2013/01/09 by Yingbai Yan, Yan, Y. J., A. F. Wang +15
Materials Science · #FOS: Physical sciences #Iron-based superconductors research #Strongly Correlated Electrons (cond-mat.str-el) #Superconductivity (cond-mat.supr-con)
paper · pdf · doi:10.48550/arxiv.1301.1734
openalex publication_date 2013/01/09 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
We report Hall measurement of the normal state in K- and Co-doped BaFe2As2, as well NaFe1-xCoxAs. We found that a power-law temperature dependence of Hall angle, cotθ\rm H∝ Tβ, prevails in normal state with temperature range well above the structural, spin-density-wave and superconducting transitions for the all samples with various doping levels. The power β is nearly 4 for the parent compounds and the heavily underdoped samples, while around 3 for the superconducting samples. The β suddenly changes from 4 to 3 at a doping level that is close to the emergence of superconductivity. It suggests that the β of ∼ 3 is clearly tied to the superconductivity. Our data suggest that, similar to cuprates, there exists a connection between the physics in the normal state and superconductivity of iron-pnictides. These findings shed light on the mechanism of high-temperature superconductivity.