Q dependence of magnetic resonance mode on FeTe0.5Se0.5 studied by inelastic neutron scattering

Motoyuki Ishikado, Katsuaki Kodama, Ryoichi Kajimoto, Mitsutaka Nakamura, Yasuhiro Inamura, Kazuhiko Ikeuchi, Sungdae Ji, Masatoshi Arai, Shin Ichi Shamoto

Research output: Contribution to journalArticlepeer-review

Abstract

Inelastic neutron scattering measurements have been performed on a superconducting single crystal FeTe 0.5 Se 0.5 to examine the Q -dependent enhancement of the dynamical structure factor, S(Q,E), from Q = (0, 0) to (π, π), including (π, 0) in the superconducting state. In most of iron-based superconductors, S(Q,E) is enhanced at Q = (π, 0), where the ‘magnetic resonance mode’ is commonly observed in the unfolded Brillouin zone. Constant-E cuts of S(Q,E) suggest that the enhancement is not uniform in the magnetic excitation, and limited around Q = (π, 0). This result is consistent with the theoretical simulation of the magnetic resonance mode due to the Bardeen–Cooper–Schrieffer coherence factor with the sign-reversing order parameter of s ± wave.

Original languageEnglish
Article number69
JournalCondensed Matter
Volume4
Issue number3
DOIs
Publication statusPublished - 2019 Sept

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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