Abstract
A polarized neutron diffraction experiment gives direct evidence for a charge order in the extremely low-carrier system Yb 4As 3. Inelastic neutron scattering experiments on Yb 4As 3 revealed the existence of low-energy spin excitations that are characteristic of a one-dimensional antiferromagnetic coupling at low temperatures. The results indicate that the one-dimensional arrangement of Yb 3+ ions caused by the charge order plays a main role for the heavy-electron behavior in Yb 4As 3.
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