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TT: Tiefe Temperaturen
TT 25: Correlated Electrons - Poster Session
TT 25.83: Poster
Mittwoch, 29. März 2006, 14:30–18:30, P1
Fading of the magnetic order transition in CePt3 Si under pressure — •Johannes Spehling1, Olaf Zelesnik1, Andreas Eichler1, and Ernst Bauer2 — 1Inst. f. Angewandte Physik, TU Braunschweig, D-38106 Braunschweig, Germany — 2Inst. f. Festkörperphysik, TU Wien, A-1040 Wien, Austria
We have carried out specific heat measurements on CePt3 Si at low temperatures from ambient pressure up to 1.5 GPa. A maximum of C /T around 2.2 K is observed which is commonly attributed to an antiferromagnetic transition. From our results it appears to consist of two superimposed anomalies separated by about 0.2 K. The pressure dependence of the lower anomaly can be described by a second order power law T1(p), which leads to a critical pressure of nearly pc = 2.4 GPa. The second anomaly near the higher temperature T2 is also weakened under pressure.