Inelastic neutron scattering study on YbFe2Al10
CeT2Al10 compounds exhibit a Kondo insulator (T=Fe) to an unconventional long-range magnetic order (T=Ru, Os). Recently P. Khuntia et. al. measured magnetization, specific heat, and NMR on YbFe2Al10. The dc susceptibility at low temperatures is strongly enhanced in weak magnetic fields accompanied by a -lnT divergence of the low-T specific heat coefficient in zero field, which points to a ground state of correlated electrons. The system displays valence fluctuating behavior in the low to intermediate temperature range, whereas above 400 K, Yb3+ carries a full and stable moment and Fe carries a moment of about 3.1 µB. The enhanced value of the Sommerfeld Wilson ratio and the spin-lattice relaxation rate suggest the presence of ferromagnetic correlations. 27Al (1/T1T) simultaneously tracks the valence fluctuations from the 4f Yb ions in the high T range and the field dependent Kondo-like correlations among small Fe 3d moments (0.5 µB) at low T, which evolve out of an Yb 4f admixed conduction band. We want to perform inelastic neutron scattering using IN4 to understand the low energy and high energy spin dynamics governing the underlying magnetism of the YbFe2Al10 compound.
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D.T. Adroja; ALEKSEEV Pavel A; Amitava Bhattacharyya; FAK Bjorn; MIGNOT Jean Michel and STRYDOM Andre. (2016). Inelastic neutron scattering study on YbFe2Al10. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.4-01-1498
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