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A new model for the crystal field and the quadrupolar phase transitions of UPd3

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.

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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 > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
URI: http://discovery.ucl.ac.uk/id/eprint/9754
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