2017/11/28 by M. A. Tanatar, Tanatar, M. A., Yong Liu +9
Materials Science · #FOS: Physical sciences #Iron-based superconductors research #Superconductivity (cond-mat.supr-con)
paper · pdf · doi:10.48550/arxiv.1711.10094
openalex publication_date 2017/11/28 · openalex created_date 2017/12/04 · openalex updated_date 2026/07/28
In-plane resistivity measurements as a function of temperature and magnetic field up to 35~T with precise orientation within the crystallographic ac-plane were used to study the upper critical field, Hc2, of the hole-doped iron-based superconductor Ba1-xKxFe2As2. Compositions of the samples studied were spanning from underdoped x=0.17 (Tc=12~K) and x=0.22 (Tc=20~K), both in the coexistence range of stripe magnetism and superconductivity, though optimal doping x=0.39 (Tc=38.4~K), x=0.47 (Tc=37.2~K), to overdoped x=0.65 (Tc=22~K), x=0.83 (Tc=10~K). We find notable doping asymmetry of the shapes of the anisotropic Hc2(T) suggesting important role of paramagnetic limiting effects in H ∥ a configuration in overdoped compositions and multi-band effects in underdoped compositions.