2022/01/24 by Yu Liu, Aifeng Wang, V. N. Ivanovski +4
Chemistry · Materials Science · Physics and Astronomy · #Chalcogen #Chemistry #Condensed matter physics #Crystallography #Density of states #Doping #Electron #Electronic structure #Fermi level #Iron-based superconductors research #Materials science #Physics #Physics of Superconductivity and Magnetism #Quantum mechanics #Rare-earth and actinide compounds #Seebeck coefficient #Superconductivity #Thermodynamics #Thermoelectric effect #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.105.045133
published as Phys. Rev. B 105, 045133 (2022)
openalex publication_date 2022/01/24 · openalex created_date 2022/01/26 · arxiv created 2022/02/27 · arxiv updated 2022/03/01 · openalex updated_date 2026/08/05
We report thermoelectric studies of FeS1-xSex (x = 0, 0.06) superconducting single crystals that feature high irreversibility fields and critical current density Jc comparable to materials with much higher superconducting critical temperatures (Tc's). The ratio of Tc to the Fermi temperature TF is very small indicating weak electronic correlations. With a slight selenium substitution on sulfur site in FeS both Tc/TF and the effective mass m^* rise considerably, implying increase in electronic correlation of the bulk conducting states. The first-principle calculations show rise of the density of states at the Fermi level in FeS0.94Se0.06 when compared to FeS which is related not only to Fe but also to chalcogen-derived electronic states.