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2 Materials Science Poland

2 2007

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Magnetism and electronictransport properties of Ce5CuPb3

Tran V. H., Jarmulska J., Miiller W.

Materials Science Poland

2007

Vol. 25, No. 2

327--332

Polycrystalline sample of the ternary Ce-based compound Ce5CuPb3 was prepared and characterized using room temperature powder X-ray, EDX analysis as well as by magnetic susceptibility, electrical resistivity, and thermoelectric power measurements. The compound crystallizes in the Ti5Ga4-type structure (space group P63/mcm) with two different cerium sites: one at the 4d and the other at 6g position. The susceptibility shows two successive magnetic phase transitions at TC1 = 46.0 š 0.5 K and TC2 = 5.0 š 0.5 K. The double magnetic phase transition may be explained by two inequivalent magnetic sublattices of Ce3+ ions. The analysis of the magnetic data suggests that the transition at TC1 is of ferromagnetic origin and at TC2 is of ferrimagnetic one. Both the magnetic susceptibility, and electrical resistivity data imply the localized character of the Ce 4f electron. Above 150 K the ?(T) data follow the Curie-Weiss law with the effective moment žeff = 2.69 žB/Ce and the paramagnetic Curie temperature ?p equal to -21.8 K. The electrical resistivity exhibits a clear anomaly at TC1, below which the resistivity sharply decreases due to the reduction in the spin-disorder scattering. The thermoelectric power (TEP, S) of Ce5CuPb3 is negative over the temperature range studied, reaching the value of -14 žV/K at room temperature, and weakly varying with decreasing temperature down to TC1. A rapid change in TEP occurs below 25 K with the slope S/T as large as -0.27 žV/K2.

Magnetic phase diagram of the URh1-xRuxGe system

Miiller W., Tran V. H., Kondrat A.

Materials Science Poland

2007

Vol. 25, No. 2

391--397

Magnetic phase diagram of the URhxRu1-xGe solid solutions has been reinvestigated by means of dc-magnetization, ac-susceptibility and electrical resistivity. We confirm ferromagnetic order only in alloys with x ??0.2. For a limited range of concentrations x between 0.3 and 0.35, we found features characteristic of short-range magnetic interactions. For compositions close to x = 0.4, non-Fermi liquid signature is observed in the low temperature resistivity. Thus, we report on the evolution of non Fermiliquid behaviour at a magnetic-nonmagnetic border, neighbouring with the region of the short-range interactions.