Anisotropic neutron spin resonance in superconducting BaFe1.9Ni0.1As2
O. J. Lipscombe, Leland W. Harriger, P. G. Freeman, M. Enderle, Chenglin Zhang, Miaoying Wang, Takeshi Egami, Jiangping Hu, Tao Xiang, M. R. Norman, Pengcheng Dai
DOI 10.1103/PhysRevB.82.064515 · Physical Review B
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Abstract
We use polarized inelastic neutron scattering to show that the neutron spin resonance below Tc in superconducting BaFe1.9Ni0.1As2 (Tc=20 K) is purely magnetic in origin. Our analysis further reveals that the resonance peak near 7 meV only occurs for the planar response. This challenges the common perception that the spin resonance in the pnictides is an isotropic triplet excited state of the singlet Cooper pairs, as our results imply that only the S001=±1 components of the triplet are involved.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| BaFe1.9Ni0.1As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 20 | Pressure not reported | unknown |
| YBa2Cu3O6+x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| BaFe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| BaFe1.84Co0.16As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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