Journal
PHYSICAL REVIEW B
Volume 81, Issue 18, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.81.180505
Keywords
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Funding
- U.S. NSF [DMR-0756568]
- DOE Division of Scientific User Facilities
- Chinese Academy of Sciences
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We use inelastic neutron scattering to show that for the optimally electron-doped BaFe1.9Ni0.1As2 (T-c = 20 K) iron arsenide superconductor, application of a magnetic field that partially suppresses the superconductivity and superconducting gap energy also reduces the intensity and energy of the resonance. These results demonstrate that the energy of the resonance is intimately connected to the electron pairing energy, and thus indicate that the mode is a direct probe for measuring electron pairing and superconductivity in iron arsenides.
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