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Phys. Rev. Lett. 102, 107006 (2009) [4 pages]

Inelastic Neutron-Scattering Measurements of a Three-Dimensional Spin Resonance in the FeAs-Based BaFe1.9Ni0.1As2 Superconductor

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Songxue Chi1, Astrid Schneidewind2, Jun Zhao1, Leland W. Harriger1, Linjun Li3, Yongkang Luo3, Guanghan Cao3, Zhu’an Xu3, Micheal Loewenhaupt2, Jiangping Hu4, and Pengcheng Dai1,5,*
1Department of Physics and Astronomy, The University of Tennessee, Knoxville, Tennessee 37996-1200, USA
2Technische Universität Dresden, Institut für Festkörperphysik, 01062 Dresden, Germany
3Department of Physics, Zhejiang University, Hangzhou 310027, China
4Department of Physics, Purdue University, West Lafayette, Indiana 47907, USA
5Neutron Scattering Science Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6393, USA

Received 6 December 2008; published 12 March 2009

We use inelastic neutron scattering to study magnetic excitations of the FeAs-based superconductor BaFe1.9Ni0.1As2 above and below its Tc (=20  K). In addition to gradually open a spin gap at the in-plane antiferromagnetic ordering wave vector (1, 0, 0), the effect of superconductivity is to form a three-dimensional resonance with clear dispersion along the c axis. The intensity of the resonance develops like a superconducting order parameter, and the mode occurs at distinctively different energies at (1, 0, 0) and (1, 0, 1). If the resonance energy is associated with the superconducting gap energy Δ, then Δ is dependent on the wave vector transfers along the c axis. These results suggest that one must be careful in interpreting the superconducting gap energies obtained by surface sensitive probes such as scanning tunneling microscopy and angle resolved photoemission.

© 2009 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.102.107006
DOI:
10.1103/PhysRevLett.102.107006
PACS:
74.25.Ha, 74.70.−b, 78.70.Nx

*daip@ornl.gov

See Also

See Also: M. D. Lumsden, A. D. Christianson, D. Parshall, M. B. Stone, S. E. Nagler, G. J. MacDougall, H. A. Mook, K. Lokshin, T. Egami, D. L. Abernathy, E. A. Goremychkin, R. Osborn, M. A. McGuire, A. S. Sefat, R. Jin, B. C. Sales, and D. Mandrus, Two-dimensional resonant magnetic excitation in BaFe1.84Co0.16As2, Phys. Rev. Lett. 102, 107005 (2009).

 
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