Magnonlike Dispersion of Spin Resonance in Ni-doped BaFe2As2

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2013-04-26
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Kim, M. G.
Tucker, G. S.
Pratt, D. K.
Ran, S.
Thaler, A.
Christianson, A. D.
Marty, K.
Calder, S.
Podlesnyak, A.
Bud’ko, Sergey
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Canfield, Paul
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Ames National Laboratory

Ames National Laboratory is a government-owned, contractor-operated national laboratory of the U.S. Department of Energy (DOE), operated by and located on the campus of Iowa State University in Ames, Iowa.

For more than 70 years, the Ames National Laboratory has successfully partnered with Iowa State University, and is unique among the 17 DOE laboratories in that it is physically located on the campus of a major research university. Many of the scientists and administrators at the Laboratory also hold faculty positions at the University and the Laboratory has access to both undergraduate and graduate student talent.

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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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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." Physical Review Letters 110, no. 17 (2013): 177002. DOI: 10.1103/PhysRevLett.110.177002. Posted with permission.

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Tue Jan 01 00:00:00 UTC 2013
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