Abstract
An explanation is given for the observed magnetic-field dependence of the low-temperature specific-heat coefficient of Yb4As3. It is based on a recently developed model for that material which can explain the observed heavy-fermion behaviour. According to it, the Yb3+ ions are positioned in a net of parallel chains with an effective spin coupling of the order of J ≈ 25 K. The magnetic-field dependence can be understood by including a weak magnetic coupling J' between adjacent chains. The data require a ratio J'/J ≈ 10−4. In that case the experimental results can be reproduced very well by the theory.
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