Degiorgi, Leonardo E.Dressel, MartinGrüner, GeorgeWachter, PeterSato, NoriakiKomatsubara, Takemi2009-08-312016-03-312009-08-312016-03-311994316359203http://nbn-resolving.de/urn:nbn:de:bsz:93-opus-46203http://elib.uni-stuttgart.de/handle/11682/7046http://dx.doi.org/10.18419/opus-7029We have investigated the electrodynamic response of UPd2Al3 both above and below the antiferromagnetic phase transition at TN = 14 K. At low temperatures, we observe the formation of a low-frequency narrow resonance, which indicates the development of the many-body coherent state. However, we do not fmd any evidence of a gap absorption associated with a spin-density-wave state, which would develop if the state arised as a consequence of a Fermi surface instability.eninfo:eu-repo/semantics/openAccessElektrodynamik , Schwere-Fermionen-System530article