s±-like spin resonance in the iron-based nodal superconductor BaFe2(As0.65P0.35)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

doi:10.1103/PhysRevB.84.144517

s±-like spin resonance in the iron-based nodal superconductor BaFe2(As0.65P0.35)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

DOI 10.1103/PhysRevB.84.144517 · Physical Review B

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Abstract

We performed inelastic neutron scattering on a powder sample of iron-based superconductor BaFe2(As0.65P0.35)2 with Tc=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 Tc than the other iron-based superconductors with nodal symmetry, such as LaFePO1−y and KFe2As2 (Tc<10 K). Comparison with theoretical calculation indicates horizontal line nodes may be a candidate for reproducing the observation.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
BaFe2(As0.65P0.35)2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	30	Pressure not reported	unknown
BaFe2(As0.65P0.35)2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	30	Pressure not reported	unknown
SmFeAs(O,F) Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	45	Pressure not reported	unknown
(Ba,K)Fe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	38	Pressure not reported	unknown
PrFeAsO1-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	35	Pressure not reported	unknown
LiFeAs Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	16	Pressure not reported	unknown
LaFePO1-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	7	Pressure not reported	unknown
KFe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	3	Pressure not reported	unknown