The field-induced gap observed in the specific heat of Yb 4 As 3 is interpreted as being due to the effective staggered field introduced by the alternating g -tensor and alternating Dzyaloshinsky-Moriya interactions. This mechanism also provides a natural explanation for the anomalous increase of magnetic susceptibility at low temperatures. A specific prediction is made for the dependence of the gap on the field direction.
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Oshikawa et al. (1999) studied this question.
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