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AM: Magnetismus
AM 9: Postersitzung Fürstenberghaus
AM 9.12: Poster
Tuesday, March 18, 1997, 09:30–12:30, F"u
µ SR ON THE NOVEL HEAVY-FERMION SYSTEM Nd2−yCeyCuO4 — •M. Hillberg, W. Wagener, M.A.C. de Melo, H.-H. Klau"s, W. Kopmann, F.J. Litterst, P. Adelmann, and G. Czjzek —
∗ Institut für Metallphysik und Nukleare Festkörperphysik
TU Braunschweig Mendelssohnstraße 3, 38106 Braunschweig
† Forschungszentrum Karlsruhe, Institut für Nukleare Festkörperphysik
The magnetic correlations in Nd2−yCeyCuO4 have been studied by zero and
longitudinal field µ SR . Nd1.8Ce0.2CuO4 reveals a saturation of the muon
relaxation rate below 0.5 K. Even down to 70 mK
LF spectra evidence spin fluctuations in the dynamic
regime with a rate of ∼ 109 s−1 excluding long range magnetic
order or spin glass freezing. The average Nd moment is estimated
to be ≈ 0.2 µB, i. e., strongly
reduced from the value determined for the ground state Kramers doublet
of Nd2CuO4 .
Extending former µ SR measurements on Nd2CuO4 , a gradual enhancement
of the internal field has been detected below 10 K
which is accompanied by an increase of the relaxation
rate. These results are attributed to a development of ordered
Nd moments.