Anisotropic itinerant magnetism and spin fluctuations in BaFe2As2: A neutron scattering study

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dc.creatorMatan, K.
dc.creatorMorinaga, R.
dc.creatorIida, K.
dc.creatorSato, T. J.
dc.date2008-10-27
dc.date2009-02-13
dc.date.accessioned2026-07-07T12:46:59Z
dc.date.available2026-07-07T12:46:59Z
dc.descriptionNeutron scattering measurements were performed to investigate magnetic excitations in a single-crystal sample of the ternary iron arsenide 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. The in-plane spin-wave velocity v_ab and out-of-plane spin-wave velocity v_c measured at 12 meV are 280(150) and 57(7) meV A, respectively. At high energy, we observe anisotropic scattering centered at the antiferromagnetic wave vectors. This scattering indicates two-dimensional spin dynamics, which possibly exist inside the Stoner continuum. At T_N=136(1) K, the gap closes, and quasi-elastic scattering is observed above T_N, indicative of short-range spin fluctuations. In the paramagnetic state, the scattering intensity along the L direction becomes "rodlike," characteristic of uncorrelated out-of-plane spins, attesting to the two-dimensionality of the system.
dc.description6 pages, 4 figures; corrected correlation lengths, added Figure 4, published version
dc.identifierhttps://arxiv.org/abs/0810.4790
dc.identifierhttp://arxiv.org/abs/0810.4790
dc.identifierPhys. Rev. B 79, 054526 (2009)
dc.identifierdoi:10.1103/PhysRevB.79.054526
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/221566
dc.subjectStrongly Correlated Electrons
dc.subjectSuperconductivity
dc.titleAnisotropic itinerant magnetism and spin fluctuations in BaFe2As2: A neutron scattering study
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