Reciprocal-space structure and dispersion of the magnetic resonant mode in the superconducting phase of RbxFe2-ySe2 single crystals

被引:61
作者
Friemel, G. [1 ]
Park, J. T. [1 ]
Maier, T. A. [2 ,3 ]
Tsurkan, V. [4 ,5 ]
Li, Yuan [1 ]
Deisenhofer, J. [4 ]
von Nidda, H. -A. Krug [4 ]
Loidl, A. [4 ]
Ivanov, A. [6 ]
Keimer, B. [1 ]
Inosov, D. S. [1 ]
机构
[1] Max Planck Inst Festkorperforsch, D-70569 Stuttgart, Germany
[2] Oak Ridge Natl Lab, Comp Sci & Math Div, Oak Ridge, TN 37831 USA
[3] Oak Ridge Natl Lab, Ctr Nanophase Mat Sci, Oak Ridge, TN 37831 USA
[4] Univ Augsburg, Inst Phys, Ctr Elect Correlat & Magnetism, D-86135 Augsburg, Germany
[5] Moldavian Acad Sci, Inst Appl Phys, MD-2028 Kishinev, Moldova
[6] Inst Max Von Laue Paul Langevin, F-38042 Grenoble 9, France
关键词
TRANSITIONS; SEPARATION; ORDER; CS;
D O I
10.1103/PhysRevB.85.140511
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
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 root 5 x root 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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页数:5
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