Two-dimensional resonant magnetic excitation in BaFe1.84Co0.16As2

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; D. Mandrus

doi:10.1103/PhysRevLett.102.107005

Two-dimensional resonant magnetic excitation in BaFe1.84Co0.16As2

Superconductivity 2009-11-13 v2 Strongly Correlated Electrons

Authors: 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 , D. Mandrus

View on arXiv ↗ PDF ↗ DOI ↗

Abstract

Inelastic neutron scattering measurements on single crystals of superconducting BaFe1.84Co0.16As2 reveal a magnetic excitation located at wavevectors (1/2 1/2 L) in tetragonal notation. On cooling below TC, a clear resonance peak is observed at this wavevector with an energy of 8.6(0.5) meV, corresponding to 4.5(0.3) kBTC. This is in good agreement with the canonical value of 5 kBTC observed in the cuprates. The spectrum shows strong dispersion in the tetragonal plane but very weak dispersion along the c-axis, indicating that the magnetic fluctuations are two-dimensional in nature. This is in sharp contrast to the anisotropic three dimensional spin excitations seen in the undoped parent compounds.

Keywords

inelastic neutron scattering resonant magnetic excitation BaFe1.84Co0.16As2 superconductivity two-dimensional magnetic fluctuations

Cite

@article{arxiv.0811.4755,
  title  = {Two-dimensional resonant magnetic excitation in BaFe1.84Co0.16As2},
  author = {M. D. Lumsden and A. D. Christianson and D. Parshall and M. B. Stone and S. E. Nagler and G. J. MacDougall and H. A. Mook and K. Lokshin and T. Egami and D. L. Abernathy and E. A. Goremychkin and R. Osborn and M. A. McGuire and A. S. Sefat and R. Jin and B. C. Sales and D. Mandrus},
  journal= {arXiv preprint arXiv:0811.4755},
  year   = {2009}
}

Comments

Include additional data showing dispersion

Two-dimensional resonant magnetic excitation in BaFe1.84Co0.16As2

Abstract

Keywords

Cite

Comments

Related papers