Dresden 2017 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
TT: Fachverband Tiefe Temperaturen
TT 19: Poster Session: Correlated Electrons 1
TT 19.12: Poster
Montag, 20. März 2017, 15:00–19:00, P2-EG
Magnetic correlations in Ce(Pt,Pd)Al3 — •Stefan Weber1, Petr Cermak2, Christian Franz1, Wolfgang Simeth1, Kirill Nemkovskiy2, Astrid Schneidewind2, and Christian Pfleiderer1 — 1Physik-Department, Technische Universität München, Garching, DE — 2Jülich Centre for Neutron Science, MLZ, Garching, DE
The nature of quantum phase transitions in selected Ce compounds is still heavily discussed [1]. The properties of these systems are characterized by the interplay of several competing energy scales. In the CeTAl3 (T=transition metal) series, T=Pt and Pd compounds are located at the border of antiferromagnetic ordering but not known to order yet [2]. Extensive measurements of the bulk properties (magnetization, susceptibility and specific heat) suggest the possible collapse of energy scales across the quantum phase transition in these systems [3]).
We studied single crystals of CePtAl3 and CePdAl3 by polarized neutron diffraction on DNS (MLZ Garching) at very low temperatures. A search for long-range magnetic order in CePtAl3 appears to be inconclusive so far with putative evidence for magnetic reflections and hysteresis. In contrast, in CePdAl3 we find clear evidence for magnetic order at low temperatures. The possible magnetic structures of both compounds will be discussed.
[1] P. Gegenwart, Q. Si, F. Steglich e.g. Nature Physics 4, 186 (2008).
[2] C. Franz, et al., J. Alloys Compd. 688, 978 (2016)
[3] C. Franz, PhD thesis, TU Munich (2014)