Abstract
Yb4As3 is a unique 4f compound having Yb3+ chains below the charge-ordering temperature Tc=290K. The Yb3+ chains are believed to be responsible for the most part of anomalous properties this material shows at low temperatures. First a microscopic Hamiltonian is derived for the Yb3+ chains from its structure and the crystal-field wave functions to show that a staggered g tensor and a staggered Dzyaloshinsky–Moriya (DM) term are present. This Hamiltonian naturally explains the energy gap formed for the magnetic field applied perpendicular to the chain. There are some experimental features, which cannot be explained by the single-chain Hamiltonian and may be due to interchain couplings. It is pointed out that the interchain DM interaction should be nonzero and may lead to an upturn of susceptibility observed at low temperatures for the magnetic field parallel to the chain.
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