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Antiferromagnetic spin fluctuations in LiFeAs observed by neutron scattering

A. E. Taylor, M. J. Pitcher, R. A. Ewings, T. G. Perring, S. J. Clarke, and A. T. Boothroyd
Phys. Rev. B 83, 220514(R) – Published 24 June 2011

Abstract

We report neutron inelastic-scattering measurements on the stoichiometric iron-based superconductor LiFeAs. We find evidence for (i) magnetic scattering consistent with strong antiferromagnetic fluctuations and (ii) an increase in intensity in the superconducting state at low energies, similar to the resonant magnetic excitation observed in other iron-based superconductors. The results do not support a recent theoretical prediction of spin-triplet p-wave superconductivity in LiFeAs but instead suggest that the mechanism of superconductivity is similar to that in the other iron-based superconductors.

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  • Received 8 April 2011

DOI:https://doi.org/10.1103/PhysRevB.83.220514

©2011 American Physical Society

Authors & Affiliations

A. E. Taylor1, M. J. Pitcher2, R. A. Ewings3, T. G. Perring3,4, S. J. Clarke2, and A. T. Boothroyd1

  • 1Department of Physics, University of Oxford, Clarendon Laboratory, Parks Road, Oxford OX1 3PU, United Kingdom
  • 2Department of Chemistry, University of Oxford, Inorganic Chemistry Laboratory, South Parks Road, Oxford OX1 3QR, United Kingdom
  • 3ISIS Facility, Rutherford Appleton Laboratory, STFC, Chilton, Didcot, Oxon OX11 0QX, United Kingdom
  • 4Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, United Kingdom

See Also

Antiferromagnetic spin excitations in single crystals of nonsuperconducting Li1xFeAs

Meng Wang, X. C. Wang, D. L. Abernathy, L. W. Harriger, H. Q. Luo, Yang Zhao, J. W. Lynn, Q. Q. Liu, C. Q. Jin, Chen Fang, Jiangping Hu, and Pengcheng Dai
Phys. Rev. B 83, 220515(R) (2011)

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Issue

Vol. 83, Iss. 22 — 1 June 2011

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