2015/01/05 by Jinghui Wang, Ruidan Zhong, Shichao Li +14
Materials Science · Physics and Astronomy · #Iron-based superconductors research #Magnetic and transport properties of perovskites and related materials #Physics of Superconductivity and Magnetism #cond-mat.mtrl-sci #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.91.014501
published as Phys. Rev. B 91, 014501 (2015) · 6 pages, 5 figures
openalex publication_date 2015/01/05 · arxiv created 2015/01/06 · arxiv updated 2015/01/07 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/04
We have performed systematic resistivity and inelastic neutron scattering measurements on Fe_0.98\ensuremath-zNizTe0.5Se0.5 samples to study the impact of Ni substitution on the transport properties and the low-energy (\ensuremath≤12meV) magnetic excitations. It is found that, with increasing Ni doping, both the conductivity and superconductivity are gradually suppressed; in contrast, the low-energy magnetic spectral weight changes little. Comparing with the impact of Co and Cu substitution, we find that the effects on conductivity and superconductivity for the same degree of substitution grow systematically as the atomic number of the substituent deviates from that of Fe. The impact of the substituents as scattering centers appears to be greater than any contribution to carrier concentration. The fact that low-energy magnetic spectral weight is not reduced by increased electron scattering indicates that the existence of antiferromagnetic correlations does not depend on electronic states close to the Fermi energy.