Book/Report

FZJ-2018-02509

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Neutronenstreuung an zwischenvalenten Systemen

Walter, U. (Corresponding author)FZJ*

1985
Kernforschungsanlage Jülich, Verlag Jülich

Please use a persistent id in citations: http://hdl.handle.net/2128/18212

Report No.: Juel-1998

Abstract: The temperature dependence of the magnetic relaxation line widths (quasielastic (QE) line widths) and the crystal field excitations of some novel intermediate valent systems were measured by means of inelastic neutron scattering. Some striking new features of the alloys YbBe$_{13'}$ YbPd and Yb$_{3}$Pd$_{4}$ appoint them to belong to a new type of intermediate valent systems. YbAl$_{3}$ shows several inelastic lines, but no QE-line was measurable. The heavy fermion systems CeCu$_{6}$ and URu$_{2}$Si$_{2}$ show a strongly temperature dependent QE-line width, in course of which CeCu$_{6}$ tends towards a nonvanishing residual value for T $\rightarrow$ O, which matches with theoretical predictions. For the first time valence instabilities of Pr (Pr$\underline{Pd}$) and Stn (Sm$_{0.51}$Y$_{0.49}$Al$_{2}$) could be prooved by neutron scattering. In addition to these experiments, in YbCu$_{2}$Si$_{2}$ and TmTe the shifts in valency, caused by external hydrostatic pressure,were studied with a pressure cell for neutron scattering, especially designed and constructed for these special purposes. The corresponding observed changes of the QE-line widths coincide with the expected values, both in sign and absolute value.

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Contributing Institute(s):

1. Publikationen vor 2000 (PRE-2000)

Research Program(s):

1. 899 - ohne Topic (POF3-899) (POF3-899)

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