Abstract
The absolute thermopower S(T) of magnetic and non-magnetic Yb-based heavy fermions compounds was investigated at ambient pressure. High pressure experiments were performed for YbSiT N =1.6 K) and YbCu 2 Si 2 . For the latter, which is not magnetically ordered at P=0, the chemical pressure effect was studied within the solid-solution Yb(Ni x Cu 1−x ) 2 Si 2 (0≤x≤1). All S(T)-curves obtained at ambient pressure are characterised by a giant negative peak at a temperature T min, S , and by an additional positive maximum at low temperature for the magnetic compounds. With increasing pressure, S(T min,S ) and T min,S were reduced, reflecting a reduction of the Kondo effect. At low temperature a magnetic transition is observed at P>8 GPa in the case of YbCu 2 Si 2 without a sign change in contrast to the alloys Yb(Ni x Cu 1−x ) 2 Si 2.
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Alami-Yadri, K., Jaccard, D. & Andreica, D. Thermopower of Yb Heavy Fermion Compounds at High Pressure. Journal of Low Temperature Physics 114, 135–149 (1999). https://doi.org/10.1023/A:1021801903961
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DOI: https://doi.org/10.1023/A:1021801903961