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TT: Tiefe Temperaturen
TT 1: Schwere Fermionen
TT 1.1: Hauptvortrag
Montag, 27. März 2000, 09:30–10:00, H20
Magnetic Exciton Mediated Superconductivity in UPd2Al3 — •Noriaki Sato1, N. Aso2, K. Miyake3, R. Shiina4, P. Thalmeier4, G. Varelogiannis5, C. Geibel4, F. Steglich4, P. Fulde5, and T. Komatsubara6 — 1Physics Department, Nagoya University, Nagoya 464−8602, Japan — 2Institute for Solid State Physics, University of Tokyo, Ibaraki 319−1106, Japan — 3Department of Physical Science, Osaka University, Toyonaka 560−8531, Japan — 4Max-Planck-Institut für Chemische Physik fester Stoffe, D-01187 Dresden, Germany — 5Max-Planck-Institut für Physik komplexer Systeme, D-01187 Dresden, Germany — 6Physics Department, Tohoku University, Sendai 980−8578, Japan
UPd2Al3 is a unique and fascinating material, in which the 5f electrons of uranium atoms are responsible not only for an antiferromagnetically ordered state, but also for superconductivity. Of special interest is the interaction between magnetism and superconductivity; magnetic order may both compete and coexist with the superconducting state and magnetic fluctuations may even assist the formation of Cooper pairs. We present experimental results of inelastic neutron scattering measurements, and also give an analysis within a phenomenological model, which leads us to suggest that UPd2Al3 is a magnetic exciton-mediated strong-coupling superconductor. It is particularly interesting to compare the neutron scattering spectra to those deduced from tunneling experiments reported by Jourdan et al. Our calculations within the Eliashberg equation clearly show the consistency between those spectra. We will represent all of these measured and calculated results at the Meeting.