Issue |
Europhys. Lett.
Volume 62, Number 2, April 2003
|
|
---|---|---|
Page(s) | 251 - 256 | |
Section | Condensed matter: electronic structure, electrical, magnetic, and optical properties | |
DOI | https://doi.org/10.1209/epl/i2003-00353-8 | |
Published online | 01 April 2003 |
Crystal-field levels in pure and diluted
studied by neutron
inelastic scattering technique
1
Institute of Industrial Science, The University of Tokyo Meguro,
Tokyo 153-8505, Japan
2
RIKEN Harima Institute - Mikazuki, Sayo, Hyogo 679-5148, Japan
3
Swiss Light Source, Paul Scherrer Institute - CH-5232 Villigen,
Switzerland
4
Laboratory for Neutron Scattering, ETH & PSI - CH-5232 Villigen PSI,
Switzerland
5
Physical Chemistry, Saarland University - D-66123 Saarbrucken,
Germany
Corresponding author: naka@spring8.or.jp
Received:
13
December
2002
Accepted:
17
February
2003
Inelastic neutron scattering experiments on
and
have been performed. The
results enable us to infer important properties of the
crystal-field levels of
in
which
has fascinating structural and magnetic properties that are
attributed to the electronic states of the
ion. While no
clear excitation was observed in pure
, three
excitations from the ground state with the energies 1.4, 4.1 and
5.8 meV were observed in
. By comparing the present
results with the previous crystal-field calculation, we infer that the
ground state of
in
is
which is split into two Kramers doublets by the tetragonal
potential. Additionally, the heat capacity measured on the
diluted system is compared with a calculation using the low part
of the energy level scheme obtained from the neutron experiments.
Good agreement between theory and experiment is obtained.
PACS: 71.70.Ch – Crystal and ligand fields / 78.70.Nx – Neutron inelastic scattering / 71.27.+a – Strongly correlated electron systems; heavy fermions
© EDP Sciences, 2003
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