2009/10/31 by Jinsheng Wen, Guangyong Xu, Zhijun Xu +7 · 50 citations
Materials Science · Physics and Astronomy · #Antiferromagnetism #Atomic physics #Condensed matter physics #Field (mathematics) #Inelastic neutron scattering #Intensity (physics) #Iron-based superconductors research #Magnetic field #Materials science #Neutron scattering #Nuclear magnetic resonance #Optics #Physics #Physics of Superconductivity and Magnetism #Rare-earth and actinide compounds #Resonance (particle physics) #Scattering #Superconductivity #cond-mat.mtrl-sci #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.81.100513
published in Physical Review B 81(10) (American Physical Society) · 4 pages, 3 figures
openalex publication_date 2010/03/25 · arxiv created 2010/03/26 · arxiv updated 2010/03/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
Inelastic neutron scattering and susceptibility measurements have been performed on the optimally doped Fe-based superconductor FeTe0.5Se0.5, which has a critical temperature, Tc of 14 K. The magnetic scattering at the stripe antiferromagnetic wave vector Q=(0.5,0.5) exhibits a ``resonance'' at \ensuremath∼6 meV, where the scattering intensity increases abruptly when cooled below Tc. In a 7-T magnetic field parallel to the a\text\ensuremath-b plane, Tc is slightly reduced to \ensuremath∼12 K, based on susceptibility measurements. The resonance in the neutron-scattering measurements is also affected by the field. The resonance intensity under field cooling starts to rise at a lower temperature \ensuremath∼12 K, and the low-temperature intensity is also reduced from the zero-field value. Our results provide clear evidence for the intimate relationship between superconductivity and the resonance measured in magnetic excitations of Fe-based superconductors.