Transition from Three-Dimensional Anisotropic Spin Excitations to Two-Dimensional Spin Excitations by Electron Doping the FeAs-Based BaFe1.96Ni0.04As2 Superconductor
Leland W. Harriger, Astrid Schneidewind, Shiliang Li, Jun Zhao, Zhengcai Li, Wei Lu, Xiaoli Dong, Fang Zhou, Zhongxian Zhao, Jiangping Hu, Pengcheng Dai
DOI 10.1103/PhysRevLett.103.087005 · Physical Review Letters
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Abstract
We use neutron scattering to study the effect of electron doping on the structural or magnetic order in BaFe2As2. In the undoped state, BaFe2As2 exhibits simultaneous structural and magnetic phase transitions below 143 K. Upon electron doping to form BaFe1.96Ni0.04As2, the system first displays the lattice distortion near ∼97 K, and then orders antiferromagnetically at 91 K before developing weak superconductivity below ∼15 K. The effect of electron doping is to reduce the c-axis exchange coupling in BaFe2As2 and induce quasi-two-dimensional (2D) spin excitations. These results suggest that the transition from 3D spin waves to quasi-2D spin excitations by electron doping is important for the separated structural and magnetic phase transitions in iron arsenides.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| BaFe1.96Ni0.04As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 15 | Pressure not reported | onset |
| BaFe1.96Ni0.04As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 15 | Pressure not reported | onset |
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