Evolution of spin excitations into the superconducting state in FeTe 1-x Se x

M. D. Lumsden, A. D. Christianson, E. A. Goremychkin, S. E. Nagler, H. A. Mook, M. B. Stone, D. L. Abernathy, T. Guidi, G. J. MacDougall, C. De La Cruz, A. S. Sefat, M. A. McGuire, B. C. Sales, D. Mandrus

Research output: Contribution to journalArticlepeer-review

Abstract

The origin of the superconducting state in the recently discovered Fe-based materials is the subject of intense scrutiny. Neutron scattering and NMR (ref.8) measurements have already demonstrated a strong correlation between magnetism and superconductivity. A central unanswered question concerns the nature of the normal-state spin fluctuations that may be responsible for the pairing. Here we present inelastic neutron scattering measurements from large single crystals of superconducting and non-superconducting Fe1+y Te1-x Sex. These measurements indicate a spin fluctuation spectrum dominated by two-dimensional incommensurate excitations extending to energies greater than 250 meV. Most importantly, the spin excitations in Fe 1+y Te1-x Sex have four-fold symmetry about the (1, 0) wavevector (square-lattice (π, π) point). Moreover, the excitations are described by the identical wavevector and can be characterized by the same model as the normal-state spin excitations in the high-TC cuprates. These results demonstrate commonality between the magnetism in these classes of materials, which perhaps extends to a common origin for superconductivity.

Original languageEnglish (US)
Pages (from-to)182-186
Number of pages5
JournalNature Physics
Volume6
Issue number3
DOIs
StatePublished - Mar 2010
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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