Publications in Scientific Journals:

T. Burghardt, H. Neemann, E. Bauer, A. Eichler:
"Successive phase transitions in CePd2Ga3 on the route from ferro- to paramagnetism";
Journal of Physics: Condensed Matter, 17 (2005), S871 - S876.

English abstract:
Successive phase transitions in CePd2Ga3 on the route from ferro- to paramagnetism
T Burghardt1, H Neemann1, E Bauer2 and A Eichler1
1 Institut für Angewandte Physik, Technische Universität Braunschweig, Mendelssohnstraße 2, D-38106 Braunschweig, Germany
2 Institut für Festkörperphysik, Technische Universität Wien, Wiedner Hauptstraße 8-10, A-1040 Wien, Austria

E-mail: a.eichler@tu-bs.de

Received 5 January 2005
Published 4 March 2005
Print publication: Issue 11 (23 March 2005)

Abstract. Several years ago CePd2Ga3 was characterized as a ferromagnetically ordered Kondo lattice system. Resistance measurements evidenced the disappearance of the ordered phase under high pressures around an extrapolated value of 5 GPa. Thus, this material appeared to offer the chance to study a quantum critical point between a ferromagnetic Kondo phase and the paramagnetic state which is a rather rare scenario. In DC susceptibility measurements under pressure, however, the magnetic phase transition was found to disappear already at much lower pressures ({\sim }2.4 GPa), which was interpreted as a change in the type of magnetic order.

Here we present new results from AC susceptibility and specific heat measurements closely investigating the pressure range around and above the assumed magnetic breakdown. While the specific heat data do not significantly show changes in the phase transition characteristics, the susceptibility data corroborate the former result of a magnetic change close to 2.3 GPa and, moreover, add another transition near 2.8 GPa. They also support the idea of antiferromagnetism in the phase next to the paramagnetic state.

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