Dresden 2003 – wissenschaftliches Programm
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SYEC: Materials under extreme conditions
SYEC 3: Extreme Conditions (Poster Session)
SYEC 3.10: Poster
Mittwoch, 26. März 2003, 13:00–19:00, P2a
Electrical resistivity measurements of Ce2Ni2Sn and
Ce2Pd2.04Sn0.96 under high pressure — •G. A. Dionicio1, H. Wilhelm1, G. Sparn1, and B. Chevalier2 — 1Max-Planck Institut für Chemische Physic fester Stoffe, Nöthnitzer Str. 40, 01187 Dresden — 2Institut de Chimie de la Matière Condensée de Bordeaux (ICMCB-CNRS), Avenue du Docteur A. Schweitzer, 33608 Pessac Cedex, France
Ce2Ni2Sn and Ce2Pd2.04Sn0.96 are Kondo systems which order antiferromagnetically at TN =3.52 K and TN = 4.48 K, respectively. In addition, the second system enters a ferromagnetic phase at TC = 2.2 K. With the aim to study the influence of pressure on the magnetic transition temperatures, electrical resistivity measurements have been performed up to 10 GPa in a Bridgman-type of high pressure cell. We will report experimental data that reveal the suppression of the long-range magnetic order in Ce2Ni2Sn as the pressure is increased. This could be understood as a Kondo compensation of the local moments. On the other side, Ce2Pd2.04Sn0.96 develops pronounced drops in resistivity around 24 K between 1 GPa and 8.26 GPa. The changes in the resistivity are accompanied by some anomalies at slightly higher temperatures. This and further details of the (T,p) phase diagram will be presented.