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Autori: J. Zhao, C. R. Rotundu, K. Marty, M. Matsuda, Y. Zhao, C. Setty, E. B. -C., J. Hu, D.-H. Lee, and R. J. Birgeneau
Editorial: APS, Physical Review Letters, 110, p.147003, 2013.
Magnetic correlations in isovalently doped Ba(Fe1-xRux)2As2 (x=0.25, Tc=14.5 K; x=0.35, Tc=20 K) are studied by elastic and inelastic neutron scattering techniques. A relatively large superconducting spin gap accompanied by a weak resonance mode is observed in the superconducting state in both samples. In the normal state, the magnetic excitation intensity is dramatically reduced with increasing Ru doping toward the optimally doped regime. Our results favor that the weakening of the electron-electron correlations by Ru doping is responsible for the dampening of the resonance mode, as well as the suppression of the normal state antiferromagnetic correlations near the optimally doped regime in this system.
Cuvinte cheie: iron arsenide superconductors, Ru-doped Bafe2As2