S ±-like spin resonance in the iron-based nodal superconductor BaFe 2(As 0.65P 0.35) 2 observed using inelastic neutron scattering

Motoyuki Ishikado, Yuki Nagai, Katsuaki Kodama, Ryoichi Kajimoto, Mitsutaka Nakamura, Yasuhiro Inamura, Shuichi Wakimoto, Hiroki Nakamura, Masahiko Machida, Katsuhiro Suzuki, Hidetomo Usui, Kazuhiko Kuroki, Akira Iyo, Hiroshi Eisaki, Masatoshi Arai, Shin Ichi Shamoto

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We performed inelastic neutron scattering on a powder sample of iron-based superconductor BaFe 2(As 0.65P 0.35) 2 with T c=30 K. Although this system is expected to have line nodes in its superconducting order parameter, we have observed spin resonance at the same scattering vector as that appearing in the s ±-wave iron-based superconductors without line nodes. Moreover, the resonance enhancement, which can be a measure of the area of sign reversal between the hole and electron Fermi surfaces (FSs), is comparable to those without line nodes. These facts indicate that the sign reversal between the FSs is still dominant in this system, and the line nodes should create only a limited area of sign reversal on a single FS. Hence the system can hold higher T c than the other iron-based superconductors with nodal symmetry, such as LaFePO 1-y and KFe 2As 2 (T c<10 K). Comparison with theoretical calculation indicates horizontal line nodes may be a candidate for reproducing the observation.

Original languageEnglish
Article number144517
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number14
Publication statusPublished - 2011 Oct 17

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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