Magnetic Resonant Mode in the Low-Energy Spin-Excitation Spectrum of 
Superconducting Rb2Fe4Se5 Single Crystals

Park, J. T.; Friemel, G.; Li, Y.; Kim, J. H.; Tsurkan, V.; Deisenhofer, J.; von Nidda, H. A. K.; Loidl, A.; Ivanov, A.; Keimer, B.; Inosov, D. S.

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Magnetic Resonant Mode in the Low-Energy Spin-Excitation Spectrum of Superconducting Rb₂Fe₄Se₅ Single Crystals

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Keimer, B.
Department Solid State Spectroscopy (Bernhard Keimer), Max Planck Institute for Solid State Research, Max Planck Society;

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Inosov, D. S.
Department Solid State Spectroscopy (Bernhard Keimer), Max Planck Institute for Solid State Research, Max Planck Society;

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Citation

Park, J. T., Friemel, G., Li, Y., Kim, J. H., Tsurkan, V., Deisenhofer, J., et al. (2011). Magnetic Resonant Mode in the Low-Energy Spin-Excitation Spectrum of Superconducting Rb₂Fe₄Se₅ Single Crystals. Physical Review Letters, 107(17): 177005.

Cite as: https://hdl.handle.net/21.11116/0000-000E-C14D-2

Abstract

We have studied the low-energy spin-excitation spectrum of the single-crystalline Rb(2)Fe(4)Se(5) superconductor (T(c) = 32 K) by means of inelastic neutron scattering. In the superconducting state, we observe a magnetic resonant mode centered at an energy of (h) over bar omega(res) = 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 root 5 X root 5 magnetic superstructure. The estimated ratios of (h) over bar omega(res)/k(B)T(c) approximate to 5.1 +/- 0.4 and (h) over bar omega(res)/2 Delta approximate to 0.7 +/- 0.1, where Delta is the superconducting gap, indicate moderate pairing strength in this compound, similar to that in optimally doped 1111 and 122 pnictides.