Abstract
By means of low-temperature measurements of the specific heat, C, and thermal expansion, α=l −1∂ l/∂ T, the magnetic properties of the quasi-one-dimensional (quasi-1D), S= 1 2 Heisenberg antiferromagnet Yb 4As 3 were investigated. In finite magnetic fields distinct anomalies were found which are pronounced differently strongly in both quantities: (i) the in- T linear contribution dominating the low- T specific heat becomes reduced with field and (ii) a peak is induced at slightly higher temperatures. The latter feature being much more pronounced in α(T, B) is well described by the classical sine-Gordon (SG) soliton solution of a 1D Heisenberg antiferromagnet with a weak easy-plane anisotropy.
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