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Article overview
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Anisotropic Itinerant Magnetism and Spin Fluctuations in BaFe2As2 | | K. Matan
; R. Morinaga
; K. Iida
; T. J. Sato
; | | Date: |
27 Oct 2008 | | Abstract: | Neutron scattering measurements were performed to investigate magnetic
excitations in a single crystal sample of the iron pnictide BaFe2As2, a parent
compound of a recently-discovered family of Fe-based superconductors. In the
ordered state, we observe low energy spin wave excitations with a gap energy of
9.8(4) meV, in-plane spin wave velocity v_ab=280(150) meV Angstrom, and
out-of-plane spin wave velocity v_c=57(7) meV Angstrom. Around 20 meV, we
observe broad scattering centered at the antiferromagnetic wavevectors on top
of the spin wave scattering, which possibly indicates spin dynamics inside the
Stoner continuum. At T_N=136(1) K, the gap closes, and quasi-elastic scattering
was observed above T_N, indicative of short-range spin fluctuations. In the
paramagnetic state, the scattering intensity along the L direction becomes
"rod-like", characteristic of uncorrelated out-of-plane spins, attesting to the
two-dimensionality of the system. | | Source: | arXiv, 0810.4790 | | Services: | Forum | Review | PDF | Favorites | |
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