2011/03/31 by Chris Stock, C. Stock, Efrain E. Rodriguez +7 · 4 citations
Chemistry · Materials Science · Physics and Astronomy · #Atomic physics #Chemistry #Condensed matter physics #Doping #Inelastic neutron scattering #Iron-based superconductors research #Materials science #Neutron #Neutron scattering #Nuclear physics #Phase (matter) #Physics #Physics of Superconductivity and Magnetism #Quantum mechanics #Rare-earth and actinide compounds #Spin (aerodynamics) #cond-mat.mtrl-sci #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.84.045124
published as Phys. Rev. B 84, 045124 (2011) · 6 pages, 5 figures, (submitted February 8, 2011)
arxiv created 2011/03/31 · openalex publication_date 2011/07/18 · arxiv updated 2015/05/27 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
Using neutron inelastic scattering, we investigate the low-energy spin fluctuations in Fe1+xTe as a function of both temperature and interstitial iron concentration. For Fe1.057(7)Te, the magnetic structure is defined by a commensurate wave vector of ((1)/(2),0,(1)/(2)). The spin fluctuations are gapped with a sharp onset at 7 meV and are three dimensional in momentum transfer, becoming two dimensional at higher-energy transfers. On doping with interstitial iron, we find, in Fe1.141(5)Te, the ordering wave vector is located at the (0.38,0,(1)/(2)) position and the fluctuations are gapless with the intensity peaked at an energy transfer of 4 meV. These results show that the spin fluctuations in the Fe1+xTe system can be tuned not only through selenium doping, but also with interstitial iron. We also compare these results with superconducting concentrations and, in particular, the resonance mode in the Fe1+xTe_1\ensuremath-ySey system.