Breakdown of the De Gennes Scaling in Y1-xDyxNi2B2C

Z. Drzazga, A. Winiarska, A. Winiarski Institute of Physics, University of Silesia, Uniwersytecka 4, 40-007 Katowice, Poland and D. Kaczorowski Institute of Low Temperature and Structure Research, Polish Academy of Sciences, P.O. Box 937, Wrocław 2, Poland

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Single crystals of Y1-xDyxNi2B2C (1 ≤ x ≤ 0.7) were examined by X-ray diffraction and stoichiometry was attested by XPS measurements. The superconducting transition temperature Tc and Neel temperature TN were determined by means of magnetisation measurements. A dramatic breakdown of the de Gennes scaling in the Dy-rich compounds was found when Tc<TN.

DOI: 10.12693/APhysPolA.97.221 PACS numbers: 74.25.Ha, 74.72.-h, 82.80.Pv