On the pressure-temperature phase diagram of the Kondo compound CeAl 2Reportar como inadecuado




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Abstract : Accurate high pressure X-ray diffraction experiments performed on a powdered single crystal of CeAl2 do not show any sizeable volume anomaly up to 150 kbar. However, high pressure electrical resistance experiments performed on a single crystal of the same batch show a continuous anomaly near 80 kbar at room temperature, i.e. close to the pressure for which Croft and Jayaraman 2 observed a strong volume anomaly. The resistance anomaly has been followed down to 2 K leading to a new line in the P-T diagram of CeAl2. This line, interpreted in terms of a crossover between two different Kondo regimes, crosses the critical line where magnetic order takes place. On the basis of our results in CeAl2, a detailed phase diagram for magnetically ordered Kondo compounds is proposed and discussed.

Keywords : aluminium alloys antiferromagnetic properties of substances cerium alloys electrical conductivity of crystalline metals and alloys high pressure effects in solids Kondo effect paramagnetic antiferromagnetic transitions phase diagrams X ray diffraction examination of materials





Autor: B. Barbara J. Beille B. Cheaito J.M. Laurant M.F. Rossignol A. Waintal S. Zemirli

Fuente: https://hal.archives-ouvertes.fr/



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