McEwen, KA;
Park, JG;
Gipson, AJ;
Gehring, GA;
(2003)
A new model for the crystal field and the quadrupolar phase transitions of UPd3.
JOURNAL OF PHYSICS-CONDENSED MATTER
, 15
(28)
S1923 - S1935.
Abstract
The double-hexagonal close-packed localized moment 5f system UPd3 exhibits four phase transitions below 8 K. We present new measurements of the magnetic susceptibility of UPd3 single crystals. The phase transitions are attributed to a sequence of antiferroquadrupolar ordered structures of the U 5f electrons on the quasi-cubic sites.From a comprehensive analysis of the neutron scattering, x-ray scattering, and bulk property measurements of this system, we have deduced a new crystal field model for UPd3. This model, which has a doublet ground state on the quasi-cubic sites with a first excited singlet some 4 meV above it, provides a qualitative understanding of the succession of quadrupolar phase transitions and order parameters of UPd3. Moreover, the new model also explains the excitations observed, by inelastic neutron scattering, in UPd3 at 2 K.
| Type: | Article |
|---|---|
| Title: | A new model for the crystal field and the quadrupolar phase transitions of UPd3 |
| Location: | JAPAN ATOM ENERGY RES INST, TOKAI, JAPAN |
| UCL classification: | UCL > School of BEAMS UCL > School of BEAMS > Faculty of Maths and Physical Sciences |
| URI: | http://discovery.ucl.ac.uk/id/eprint/9754 |
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