期刊
PHYSICAL REVIEW B
卷 79, 期 17, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.79.174527
关键词
antiferrimagnetism; arsenic alloys; barium alloys; iron alloys; magnetic resonance; neutron spectra; nickel alloys; photoemission; superconducting energy gap; superconducting materials
资金
- U.S. DOE BES [DE-FG02-05ER46202]
- NSF [DMR-0756568, DMR-0454672]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [0756568] Funding Source: National Science Foundation
We use neutron spectroscopy to determine the nature of the magnetic excitations in superconducting BaFe1.9Ni0.1As2(T-c=20 K). Above T-c the excitations are gapless and centered at the commensurate antiferromagnetic wave vector of the parent compound, while the intensity exhibits a sinusoidal modulation along the c axis. As the superconducting state is entered a spin gap gradually opens, whose magnitude tracks the T dependence of the superconducting gap as observed by angle-resolved photoemission. Both the spin-gap and magnetic-resonance energies are temperature and wave-vector dependent, but their ratio is the same within uncertainties. These results suggest that the spin resonance is a singlet-triplet excitation related to electron pairing and superconductivity.
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