Magnonlike dispersion of spin resonance in Ni-doped BaFe2As 2

M. G. Kim, G. S. Tucker, D. K. Pratt, S. Ran, A. Thaler, A. D. Christianson, K. Marty, S. Calder, A. Podlesnyak, S. L. Bud'Ko, P. C. Canfield, A. Kreyssig, A. I. Goldman, R. J. McQueeney

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Abstract

Inelastic neutron scattering measurements on Ba(Fe0.963Ni 0.037)2As2 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 QAFM along the orthorhombic a axis, the resonance disperses upwards away from QAFM 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 2As2 compounds possesses a magnonlike upwards dispersion.

Original languageEnglish
Article number177002
JournalPhysical Review Letters
Volume110
Issue number17
DOIs
StatePublished - Apr 24 2013

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