Abstract
Inelastic neutron scattering experiments under magnetic field were performed on the one-dimensional quantum antiferromagnet Yb 4As 3. When a magnetic field is applied perpendicular to the Yb 3 + chain, the material exhibits a gap-opening phenomenon due to the induced staggered field originated from the Dzyaloshinsky–Moriya interaction. It was confirmed that the spectrum remains gapless when a magnetic field is applied parallel to the Yb 3 + chain. Clear evidence for the incommensurate mode which is predicted by the theories was found.
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