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American Physical Society, Physical Review Letters, 17(110)

DOI: 10.1103/physrevlett.110.177002

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Magnonlike Dispersion of Spin Resonance in Ni-dopedBaFe2As2

Journal article published in 2013 by M. G. Kim, G. S. Tucker, D. K. Pratt, S. Ran, A. Thaler ORCID, A. D. Christianson, K. Marty, S. Calder ORCID, A. Podlesnyak, S. L. Bud’ko, P. C. Canfield, A. Kreyssig, A. I. Goldman, R. J. McQueeney
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This paper is available in a repository.

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Abstract

Inelastic neutron scattering measurements on Ba(Fe_{0.963}Ni_{0.037})_{2}As_{2} manifest a neutron spin resonance in the superconducting state with anisotropic dispersion within the Fe layer. Whereas the resonance is sharply peaked at the antiferromagnetic (AFM) wave vector Q_{AFM} along the orthorhombic a axis, the resonance disperses upwards away from Q_{AFM} along the b axis. In contrast to the downward dispersing resonance and hourglass shape of the spin excitations in superconducting cuprates, the resonance in electron-doped BaFe_{2}As_{2} compounds possesses a magnonlike upwards dispersion.