Abstract
We use neutron scattering to study the magnetic-field effect on the static antiferromagnetic (AF) order and low-energy spin excitations in the underdoped iron arsenide superconductor BaFe${}_{1.92}$Ni${}_{0.08}$As${}_{2}$. At zero field, superconductivity that occurs below a critical temperature of ${T}_{c}=17$ K coincides with the appearance of a neutron spin resonance and reduction in the static ordered moment. Upon application of a $~$10-T magnetic field in the FeAs plane, the intensity of the resonance is reduced, accompanied by decreasing ${T}_{c}$ and enhanced static AF scattering. These results are similar to those for some copper oxide superconductors, and demonstrate that the static AF order is a competing phase to superconductivity in BaFe${}_{1.92}$Ni${}_{0.08}$As${}_{2}$.
Accepted Version (
Free)
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call