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Reciprocal-space structure and dispersion of the magnetic resonant mode in the superconducting phase of RbxFe2ySe2 single crystals

G. Friemel, J. T. Park, T. A. Maier, V. Tsurkan, Yuan Li, J. Deisenhofer, H.-A. Krug von Nidda, A. Loidl, A. Ivanov, B. Keimer, and D. S. Inosov
Phys. Rev. B 85, 140511(R) – Published 20 April 2012

Abstract

Inelastic neutron scattering is employed to study the reciprocal-space structure and dispersion of magnetic excitations in the normal and superconducting states of single-crystalline Rb0.8Fe1.6Se2. We show that the recently discovered magnetic resonant mode in this compound has a quasi-two-dimensional character, similar to overdoped iron-pnictide superconductors. Moreover, it has a rich in-plane structure that is dominated by four elliptical peaks, symmetrically surrounding the Brillouin zone corner, without 5×5 reconstruction. We also present evidence for the dispersion of the resonance peak, as its position in momentum space depends on energy. Comparison of our findings with the results of band structure calculations leads to a robust bulk-sensitive estimate of the electron count in the superconducting phase and provides strong support for the itinerant origin of the observed signal. It can be traced back to the nesting of electronlike Fermi pockets in the doped metallic phase of the sample in the absence of iron-vacancy ordering.

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  • Received 7 December 2011

DOI:https://doi.org/10.1103/PhysRevB.85.140511

©2012 American Physical Society

Authors & Affiliations

G. Friemel1, J. T. Park1, T. A. Maier2, V. Tsurkan3,4, Yuan Li1,*, J. Deisenhofer3, H.-A. Krug von Nidda3, A. Loidl3, A. Ivanov5, B. Keimer1, and D. S. Inosov1,†

  • 1Max-Planck-Institut für Festkörperforschung, Heisenbergstraße 1, 70569 Stuttgart, Germany
  • 2Computer Science and Mathematics Division and Center for Nanophase Materials Sciences, Oak Ridge National Lab, Oak Ridge, Tennessee 37831, USA
  • 3Center for Electronic Correlations and Magnetism, Institute of Physics, Augsburg University, 86135 Augsburg, Germany
  • 4Institute of Applied Physics, Academy of Sciences of Moldova, MD 2028, Chisinau, Republic of Moldova
  • 5Institut Laue-Langevin, 6 rue Jules Horowitz, 38042 Grenoble Cedex 9, France

  • *Present address: International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, China.
  • Corresponding author: d.inosov@fkf.mpg.de

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Issue

Vol. 85, Iss. 14 — 1 April 2012

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