Physics – Condensed Matter – Superconductivity
Scientific paper
2011-07-08
Phys. Rev. Lett. 107, 177005 (2011)
Physics
Condensed Matter
Superconductivity
To be published in Phys. Rev. Lett. Figures and references have been updated in v2
Scientific paper
10.1103/PhysRevLett.107.177005
We have studied the low-energy spin-excitation spectrum of the single-crystalline Rb2Fe4Se5 superconductor (Tc = 32 K) by means of inelastic neutron scattering. In the superconducting state, we observe a magnetic resonant mode centered at an energy of 14 meV and at the (0.5 0.25 0.5) wave vector (unfolded Fe-sublattice notation), which differs from the ones characterizing magnetic resonant modes in other iron-based superconductors. Our finding suggests that the 245-iron-selenides are unconventional superconductors with a sign-changing order parameter, in which bulk superconductivity coexists with the sqrt(5) x sqrt(5) magnetic superstructure. The estimated ratios of the resonance energy to Tc and the superconducting gap indicate moderate pairing strength in this compound, similar to that in optimally doped 1111- and 122-pnictides.
Deisenhofer Joachim
Friemel G.
Inosov D. S.
Ivanov Anatoly A.
Keimer Bernhard
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