Magnonlike Dispersion of Spin Resonance in Ni-doped BaFe2As2

Date
2013-04-26
Authors
Kim, M. G.
Tucker, G. S.
Pratt, D. K.
Canfield, Paul
Ran, S.
Thaler, A.
Christianson, A. D.
Marty, K.
Calder, S.
Podlesnyak, A.
Bud’ko, Sergey
Canfield, Paul
Kreyssig, Andreas
Goldman, Alan
McQueeney, Robert
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Ames Laboratory
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Abstract

Inelastic neutron scattering measurements on Ba(Fe0.963Ni0.037)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 BaFe2As2 compounds possesses a magnonlike upwards dispersion.

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<p>This article is published as Kim, M. G., G. S. Tucker, D. K. Pratt, S. Ran, A. Thaler, Andrew D. Christianson, K. Marty, S. Calder, A. Podlesnyak, S. L. Bud’ko, P. C. Canfield, A. Kreyssig, A. I. Goldman, and R. J. McQueeney. "Magnonlike Dispersion of Spin Resonance in Ni-doped Ba Fe 2 As 2." <em>Physical Review Letters</em> 110, no. 17 (2013): 177002. DOI: <a href="http://dx.doi.org/10.1103/PhysRevLett.110.177002" target="_blank">10.1103/PhysRevLett.110.177002</a>. Posted with permission.</p>
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