Specific heat, electrical resistivity and thermoelectric power of YbNi4Si |
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Authors: | A. Kowalczyk T. Toliński W. Miiller M. Timko |
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Affiliation: | a Institute of Molecular Physics, Polish Academy of Sciences, Smoluchowskiego 17, 60-179 Poznań, Poland b W Trzebiatowski Institute of Low Temperature and Structure Research, Polish Academy of Sciences, P.O. Box 1410, 50-950 Wroc?aw, Poland c Institute of Experimental Physics, Slovak Academy of Sciences, Watsonowa 38, 043 53 Košice, Slovakia |
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Abstract: | The studies of the specific heat, electrical resistivity and thermoelectric power of YbNi4Si are reported. These studies are supported by magnetic susceptibility and X-ray photoemission spectroscopy (XPS) measurements. YbNi4Si does not order magnetically down to 4 K. Nearly in the whole temperature range studied the magnetic susceptibility follows a Curie law with μeff = 4.15 μB/f.u. This effective magnetic moment is close to the value expected for the 4f13 configuration (4.54 μB). The Yb2+ and Yb3+ peaks observed by XPS in the valence band region confirm the domination of the Yb3+ valence state. Based on the specific heat measurements, the electronic specific heat coefficient γ = 25 mJ/mol/K2 and the Debye temperature θD = 320 K were derived. A quadratic dependence of electrical resistivity at low temperatures has been observed. The Kadowaki-Woods ratio has been discussed. The thermoelectric power has been analyzed in the framework of the two band model. |
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Keywords: | A. Alloys B. Electrical properties C. X-ray diffraction D. Specific heat |
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